Queen Elizabeth II wears the Imperial State Crown in April 1966 (left) and in November 2006 (right). The queen marked 60 years on the throne on Monday, Feb. 6, 2012. | AP

DERSINGHAM, ENGLAND - FEBRUARY 6: Queen Elizabeth II visits Dersingham Infant and Nursery School next to Head teacher Gayle Platt (R) on February 6, 2012 in Dershingham, England. The Queen is celebrating 'Accession Day,' 60 years to the day since she became Monarch. (Photo by Arthur Edwards - WPA Pool/Getty Images)

FOR USE AS DESIRED WITH THE QUEEN MOTHER'S 100TH BIRTHDAY-- FILE--- Britain's Queen Elizabeth, the Queen Mother, right, holds her baby daughter Princess Elizabeth, later to be Queen Elizabeth II, on her christening day in this 1926 file photo. At left is Queen Mary, with King George V behind, and the Duke of York, later to become King George VI, at right. The Queen Mother celebrates her 100th birthday on Aug. 4. (AP Photo/FILE) **UNITED KINGDOM OUT**

FOR USE AS DESIRED WITH THE QUEEN MOTHER'S 100TH BIRTHDAY-- FILE--- Britain's Queen Elizabeth, the Queen Mother, poses with her husband King George VI, and their two daughters, Princess Elizabeth, centre, and Princess Margaret, following the King's coronation, in this 1937 file photo. The Queen Mother celebrates her 100th birthday on Aug. 4. (AP Photo/FILE) **UNITED KINGDOM OUT**

FOR USE AS DESIRED WITH THE QUEEN MOTHER'S 100TH BIRTHDAY-- FILE--Britain's Prime Minister Winston Churchill, center, looks on, as King George VI, Queen Elizabeth, Princess Elizabeth, left, and Princess Margaret, right, wave to crowds gathered below from the balcony of Buckingham Palace on VE Day in this May 8, 1945 file photo. The Queen Mother celebrates her 100th birthday on Aug.4. (AP Photo/FILE)

** FILE ** Britain's Queen Elizabeth II, then Princess Elizabeth, sits in Natal National Park, South Africa, on her 21st birthday, in this April 21, 1947 file photo. In the background are the Drakenberg Mountains. The Queen will celebrate her 80th birthday on April 21, 2006. (AP Photo/Eddie Worth)

QUEEN ELIZABETH AND HER CONSORT, PRINCE PHILIP, IN EARLY 1960S.

Princess Elizabeth (now Queen Elizabeth II) and her husband Prince Philip wave from the balcony of London's Buckingham Palace following their wedding at Westminster Abbey in this November 20, 1947 photo. | AP

FILE--Elizabeth II wears the bejeweled Imperial Crown and carries the Orb, in left hand, and Scepter with Cross as she leaves Westminster Abbey on June 2, 1953, at the end of the Coronation Ceremony. Queen Elizabeth II reached a bittersweet milestone Wednesday, Feb. 6, 2002, quietly marking the 50th anniversary of her father's death and her accession to the throne. Although Elizabeth's acceded to the throne in 1952, her coronation ceremony was not held until 1953. (AP Photo)

(FILES) In this file picture taken on June 2, 1953 Queen Elizabeth II and the Prince Philip pose after the Queen's Coronation, in Buckingham Palace. Queen Elizabeth II, who on february 6, 2012 marks exactly 60 years on the throne, has spent a lifetime upholding her pledges to serve her peoples, earning a reputation in the process for calm shrewdness. When she ascended to the throne in 1952 aged just 25, Winston Churchill was prime minister of Britain, Jawaharlal Nehru led the newly-independent India and swathes of Africa and Asia were still governed by Britain. AFP PHOTO/FILES (Photo credit should read HO/AFP/Getty Images) R:\Merlin\Getty_Photos\508621820.jpg

** FILE ** Britain's Queen Elizabeth II, then Princess Elizabeth, wears a silver gown with a diamond tiara and pearl necklace, in this Aug. 30, 1949 file photo. The Queen will celebrate her 80th birthday on April 21, 2006. (AP Photo)

Queen Elizabeth II makes a royal vist to Chicago on July 6, 1959, and is pictured with Gov. William G. Stratton and Mayor Richard J. Daley.

(FILES) In an undated file picture Queen Elizabeth II sits with her two children Prince Charles (R) and Princess Anne (L) in Balmoral. Britain's Queen Elizabeth II will start five months of diamond jubilee celebrations this weekend marking 60 years to the day on February 6, 2012 since she ascended to the throne after the death of her father. AFP PHOTO (Photo credit should read /AFP/Getty Images) R:\Merlin\Getty_Photos\508589316.jpg

This undated picture shows Queen Elizabeth II posing for a photograph with young Prince Charles and Princess Anne, taken in an unknown location. Queen Elizabeth II, who on february 6, 2012 marks exactly 60 years on the throne, has spent a lifetime upholding her pledges to serve her peoples, earning a reputation in the process for calm shrewdness. When she ascended to the throne in 1952 aged just 25, Winston Churchill was prime minister of Britain, Jawaharlal Nehru led the newly-independent India and swathes of Africa and Asia were still governed by Britain. AFP PHOTO/FILES (Photo credit should read STF/AFP/Getty Images) R:\Merlin\Getty_Photos\508621818.jpg

(FILES) In a file picture taken on September 8, 1960 Britain's Queen Elizabeth II, Prince Philip sit at Balmoral with their children Princess Anne (L), Prince Charles (R) and the new-born Prince Andrew (C) playing with a corgi. Britain's Queen Elizabeth II will start five months of diamond jubilee celebrations this weekend marking 60 years to the day on February 6, 2012 since she ascended to the throne after the death of her father. AFP PHOTO (Photo credit should read -/AFP/Getty Images) R:\Merlin\Getty_Photos\508589182.jpg

Britain's Queen Elizabeth II views a specially-converted 1960 Rolls-Royce Phantom V, during the launch Thursday, May 7, 1998 of the new environmentally-friendly liquid propane gas (LPG) powered Royal Car Fleet. An LPG gas refuelling point has been installed at Buckingham Palace, for 'duel fuel' vehicles which can also run on traditional gasoline in this initiative which is being led by The Queen. German automaker Volkswagen roared ahead Thursday in the race to buy Rolls-Royce Motor Cars, outbidding rival BMW s offer for the British luxury car company. (AP Photo/John Stillwell, Pool)

Britain's Queen Elizabeth II, dressed in a Muslim 'gamis' made especially for her and brought from England, tours the Jame'Asr Hassanil Bolkiah Mosque in Bandar Seri Begawan during the second day of her three day State visit to Brunei Friday Sept. 18, 1998. She is accompanied by Zaini Ali, right, a British trained architect. (AP PHOTO / Fiona Hanson) **UK OUT, MAGS OUT, NO SALES**

In this image taken on Wednesday, Dec. 15, 2010, Britain's Queen Elizabeth II is photographed at the recording of her Christmas Day broadcast to the Commonwealth, in the Chapel Royal at Hampton Court Palace in London. (AP Photo/John Stillwell, Pool)

President Barack Obama, first lady Michelle Obama, Queen Elizabeth II, and Prince Philip pose for photographers prior to a dinner hosted by the queen, Tuesday, May 24, 2011, at Buckingham Palace in London. (AP Photo/Larry Downing, Pool)

Britains' Queen Elizabeth II, left, receives British Prime Minister David Cameron at the Commonwealth Heads of Government Meeting banquet held in a hotel in Perth, Australia, on Friday, Oct. 28, 2011. (AP Photo/Andrew Meares, Pool)

Britain's Queen Elizabeth II is greeted by Irish Prime Minister Enda Kenny at Government Buildings in Dublin, Wednesday, May 18, 2011. The Queen arrived to meet with Kenny on the second day of a four day state visit to Ireland. (AP Photo/Peter Morrison)

[TIME MAGAZINE NYNTL ]SPECIAL TIME MAGAZINE--FILE0-South African President Nelson Mandela stands with Britain Queen Elizabeth II on his arrival at Buckingham Palace, in London for a state banquet in his honour following his arrival in Britain, Tuesday July 9, 1996. Mandela is on a four day state visit to Britain. (AP Photo/ WPA ROTA)

LONDON - NOVEMBER 10: Queen Elizabeth II looks on during a visit to Goodenough College to celebrate its 80th anniversary on November 10, 2011 in London, England. (Photo by Anthony Devlin - WPA Pool/Getty Images)

DERSINGHAM, ENGLAND - FEBRUARY 6: Children wave flags as Queen Elizabeth II visits Dersingham Infant and Nursery School on February 6, 2012 in Dershingham, England. The Queen is celebrating 'Accession Day,' 60 years to the day since she became Monarch. (Photo by Arthur Edwards - WPA Pool/Getty Images)

SANDRINGHAM, ENGLAND - FEBRUARY 3: Queen Elizabeth II and her daughter Princess Anne, Princess Royal arrive for a Tree Planting ceremony in the Diamond Jubilee Wood on the Sandringham estate to mark the Queen's Diamond jubilee on February 3, 2012 in Sandringham, England. Queen Elizabeth II came to the throne on February 6, 1952 after the death of her father, King George VI. Her coronation took place on June 2, 1953. (Photo by Arthur Edwards/WPA -Pool/Getty Images)

Britain's Queen Elizabeth II and her husband Prince Philip, Duke of Edinburgh, left, accompanied by an unidentified member of the clergy arrive at the church of St Peter and St Paul at West Newton, eastern England, Sunday Feb. 5, 2012. The queen braved the cold and snow to attend church Sunday on the eve of her Diamond Jubilee anniversary. The 85-year-old monarch marks 60 years on the throne on Monday. The anniversary will be marked by a series of regional, national and international events throughout 2012. Elizabeth ascended the throne when her father, George VI, died on Feb. 6, 1952. She is the longest-serving monarch after Queen Victoria, who reigned for more than 63 years. (AP Photo/PA, Chris Radburn) UNITED KINGDOM OUT NO SALES NO ARCHIVE

One of Queen Elizabeth II’s private secretaries explained the queen’s vitality: “She sleeps very well ... she’s got very good legs, and she can stand for a long time ... [she’s] as tough as a yak.” | Chris Furlong~AFP/Getty Images

[PRINCESS DIANA OBIT ]FILE--Then Lady Diana Spencer and Prince Charles pose with Queen Elizabeth II, center, in Buckingham Palace in March 27, 1981, after the queen gave her formal consent to the couple for marriage. Britain s Princess Diana, who had been struggling to build a new public and private life after her turbulent divorce, was killed Sunday, Aug. 31, 1997, along with her companion, Dodi Fayed, in a car crash as their Mercedes was being pursued by photographers in Paris. (AP Photo/file)

DERSINGHAM, ENGLAND - FEBRUARY 6: Queen Elizabeth II visits Dersingham Infant and Nursery School next to Head teacher Gayle Platt (R) on February 6, 2012 in Dershingham, England. The Queen is celebrating 'Accession Day,' 60 years to the day since she became Monarch. (Photo by Arthur Edwards - WPA Pool/Getty Images)

Britain's Queen Elizabeth II, and U.S. President Barack Obama during a state banquet in Buckingham Palace, London, on Tuesday May 24, 2011. President Barack Obama immersed himself in the grandeur of Britain's royal family Tuesday, as Queen Elizabeth II welcomed him to Buckingham Palace for the first day of a state visit. (AP Photo/Lewis Whyld, Pool)

Britain's Queen Elizabeth II, lays a wreath in the Garden of Remembrance in Dublin, Tuesday May 17, 2011. The Queen set foot on Irish soil at the start of a historic state visit which will herald a new era in relations between Britain and the Republic. Politicians on both side of the Irish Sea have described the four-day event as momentous. (AP Photo/pool)

Britain Queen Elizabeth II smiles as she is congratulated on the news of the engagement of her grandson Prince William to Kate Middleton during a reception for Leaders of the Overseas Territories at Windsor Castle Windsor England Tuesday Nov. 16, 2010. (AP Photo/ Lewis Whyld, pool)

Britain's Queen Elizabeth II greets the Prime Minister of Turkey Recep Tayyip Erdogan, center, and his wife Emine, left, during an audience at Buckingham Palace, in central London Thursday March 31, 2011. (AP Photo/Dominic Lipinski, Pool)

Prince Philip

In this image taken from video, from left, Britain's Queen Elizabeth II, Britain's Prince Philip, and Britain's Prince Charles sing during the ceremony at Westminster Abbey for the Royal Wedding in London on Friday, April, 29, 2011. (AP Photo/APTN) EDITORIAL USE ONLY NO ARCHIVE PHOTO TO BE USED SOLELY TO ILLUSTRATE NEWS REPORTING OR COMMENTARY ON THE FACTS OR EVENTS DEPICTED IN THIS IMAGE

Britain's Queen Elizabeth II, is introduced to Ireland's An Taoiseach Enda Kenny by Irish President Mary Mc Aleese, at Aras An Uachtarain, the Irish President's residence in Phoenix Park, Dublin, Tuesday May 17, 2011. The Queen set foot on Irish soil at the start of a historic state visit which will herald a new era in relations between Britain and the Republic. Politicians on both side of the Irish Sea have described the four-day event as momentous.(AP Photo/Tony Maxwell, pool)

Britain's Queen Elizabeth II (R) walks with Irish President Mary McAleese during a ceremonial welcome at the Aras an Uachtarain, the president's official residence, in Dublin on the first day of her four-day visit to Ireland, on May 17, 2011. A sombre Queen Elizabeth II laid a wreath Tuesday at a memorial for the victims of Ireland's independence struggle in a landmark gesture on the first visit by a British monarch to the Irish republic. AFP PHOTO / Peter Muhly (Photo credit should read PETER MUHLY/AFP/Getty Images) R:\Merlin\Getty_Photos\DV_To_Getty_4933028_0.jpg

Britain's Queen Elizabeth II and Prince Philip watch as Fergal Murray pours a pint of Guinness in the Gravity Bar, during a tour of the Guinness Storehouse, one of Ireland's most popular sites, in Dublin, Wednesday May 18, 2011. Both the Queen and Prince Philip, on the second day of the first-ever state visit to Ireland, declined to taste the Irish stout.(AP Photo/pool)

US President Barack Obama (L) and First Lady Michelle Obama (R) greet Britain's Queen Elizabeth II before a reciprocal dinner at the Winfield House in London, on May 25, 2011. Obama and his wife Michelle enjoyed a regal welcome from Queen Elizabeth II, who has met every US president but one since the 1950s. Obama's visit, the second stop on a European tour, comes as Britain seeks to prove its staying power despite fading military might and Washington looks to retool its decades-old alliance with Europe as a catalyst for global action. AFP Photo/Jewel Samad (Photo credit should read JEWEL SAMAD/AFP/Getty Images)

Queen Elizabeth II has been invited to the Elizabeth gathering in the past, but so far she's been unable to attend.

FILE - In this March 3, 1983 photo by Associated Press photographer Ed Reinke, President Ronald Reagan and Queen Elizabeth II raise their glasses in a toast during a state dinner at the M. H. de Young Museum in San Francisco's Golden Gate Park. Ed Reinke, an award-winning AP photographer who traveled worldwide and was known for his striking pictures of Kentucky news and sporting events, died Tuesday, Oct. 18, 2011 following an injury, according to his family. He was 60. (AP Photo/Ed Reinke, File)

Britain's Queen Elizabeth II delivers a speech during a banquet dinner as part of the Commonwealth Heads of Government Meeting (CHOGM) in Perth, Australia, Friday, Oct. 28, 2011. The British monarch's first-born child, whether a girl or a boy, will ascend the throne under new succession rules approved Friday by Commonwealth nations, reversing centuries of tradition. (AP Photo/Ron D'Raine, Pool)

FILE - Czech President Vaclav Havel adjusts his bow-tie as he accompanies Britain' s Queen Elizabeth II to the state banquet in the Spanish Hall of Prague Castle late in this March 27, 1996 file photo. Havel wears the Knight Grand and Cross of the Order of the Bath he received from the queen on the first day of her visit to the Czech Republic. Havel, the dissident playwright who wove theater into politics to peacefully bring down communism in Czechoslovakia and become a hero of the epic struggle that ended the Cold War, died Sunday Dec. 18, 2011 in Prague. He was 75. (AP Photo/Tomas Turek/CTK, File)

FILE - In this June 11, 2011 file photo, from left, Britain's Duchess of Cambridge, Prince William the Duke of Cambridge, Countess of Wessex Sophie, Prince Edward the Earl of Wessex, their daughter Louise, Princess Anne, partially seen, her husband Tim Lawrence, Britain's Queen Elizabeth II, Prince Harry, Prince Philip the Duke of Edinburgh, and Prince Andrew, watch a Royal Air Force flypast on the balcony of Buckingham Palace after returning from the Trooping the Colour ceremony marking the Queen's official birthday in London. Queen Elizabeth II's extended family will gather at Sandringham Estate for a traditional holiday weekend that will mark Kate Middleton's first Christmas as a royal, Palace officials said Friday, Dec. 23, 2011. (AP Photo/Akira Suemori, File)

File - Britain's Queen Elizabeth II and her husband Prince Philip, right, lead the annual procession of members of the Order of the Garter from Windsor Castle to St. George's Chapel in Windsor, England in this Monday, June 15, 1998 file photo. Queen Elizabeth II's husband has been taken to the hospital after experiencing chest pains, British royal officials said Friday Dec. 23 2011. A spokeswoman for Buckingham Palace said Prince Philip was taken from Sandringham, the queen's sprawling estate in rural Norfolk, to the cardiac unit at Papworth Hospital in Cambridge for "precautionary tests." (AP Photo / Alastair Grant, Pool, File)

File - Britain's Queen Elizabeth II and Prince Philip prior to The Queen's Company Grenadier Guards ceremonial review at Windsor Castle, west of London in this Tuesday, April 15, 2003 file photo. Queen Elizabeth II's husband has been taken to hospital after experiencing chest pains, British royal officials said Friday Dec 23, 2011. A spokeswoman for Buckingham Palace said Prince Philip was taken from Sandringham, the queen's sprawling estate in rural Norfolk, to the cardiac unit at Papworth Hospital in Cambridge for "precautionary tests." (AP Photo / Chris Young / Pool, file)

File - Britain's Queen Elizabeth II and Prince Philip leave Buckingham Palace in an open carriage, to attend the ceremony of Trooping the Colour, marking the Queen's official birthday in London, in this Saturday, June 12, 2004 file photo. Queen Elizabeth II's husband has been taken to the hospital after experiencing chest pains, British royal officials said Friday Dec 23, 2011. A spokeswoman for Buckingham Palace said Prince Philip was taken from Sandringham, the queen's sprawling estate in rural Norfolk, to the cardiac unit at Papworth Hospital in Cambridge for "precautionary tests." (AP Photo / John D McHugh, file)

Britain's Queen Elizabeth II, right, and her son Prince Edward make their way to the royal helicopter as they leave Papworth Hospital after visiting Prince Philip, in Cambridge, England, Saturday, Dec. 24, 2011. Philip, 90, was taken to the hospital from the queen's Sandringham estate in Norfolk late Friday after experiencing chest pains. He had a coronary stent put in after tests found a blocked artery was to blame, though the palace has refused to say if he suffered a heart attack. (AP Photo/PA, Lewis Whyld) UNITED KINGDOM OUT, NO SALES, NO ARCHIVE

Britain's Queen Elizabeth II, centre, and her husband Prince Philip,the Duke of Edinburgh, right, are joined at Clarence House, central London, Sunday Nov. 18, 2007 by members of their family on the occasion of a dinner hosted by their eldest son Prince Charles, the Prince of Wales, left, and his wife the Duchess of Cornwall, unseen, to mark the forthcoming Diamond Wedding Anniversary of The Queen and The Duke. At rear from left, are the Queen and Prince Philip's other children, Prince Andrew, the Princess Royal Anne, and Prince Edward (AP Photo/PA, Tim Graham) ** UNITED KINGDOM OUT NO SALES NO ARCHIVE **

(FILES) In this file picture taken on April 21, 2006 Britain's Queen Elizabeth II smiles as she walks along Windsor High Street in Windsor as part of her 80th Birthday celebrations. Queen Elizabeth II, who on february 6, 2012 marks exactly 60 years on the throne, has spent a lifetime upholding her pledges to serve her peoples, earning a reputation in the process for calm shrewdness. When she ascended to the throne in 1952 aged just 25, Winston Churchill was prime minister of Britain, Jawaharlal Nehru led the newly-independent India and swathes of Africa and Asia were still governed by Britain. AFP PHOTO/ADRIAN DENNIS (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)

(FILES) In this file picture taken on July 9, 1993 Queen Elizabeth II fires, under supervision of Lt Col George Harvey, during the Army Rifle Association meeting in Bisley. Queen Elizabeth II, who on february 6, 2012 marks exactly 60 years on the throne, has spent a lifetime upholding her pledges to serve her peoples, earning a reputation in the process for calm shrewdness. When she ascended to the throne in 1952 aged just 25, Winston Churchill was prime minister of Britain, Jawaharlal Nehru led the newly-independent India and swathes of Africa and Asia were still governed by Britain. AFP PHOTO/TIM OCKENDEN (Photo credit should read TIM OCKENDEN/AFP/Getty Images)

(FILES) In this file picture taken on April 4, 1955 Britain's Prime Minister Winston Churchill kisses Queen Elizabeth II's (R) hand as she leaves 10 Downing Street in London, after a dinner given by the Prime Minister. Queen Elizabeth II, who on february 6, 2012 marks exactly 60 years on the throne, has spent a lifetime upholding her pledges to serve her peoples, earning a reputation in the process for calm shrewdness. When she ascended to the throne in 1952 aged just 25, Winston Churchill was prime minister of Britain, Jawaharlal Nehru led the newly-independent India and swathes of Africa and Asia were still governed by Britain. (Photo credit should read STF/AFP/Getty Images)

Britain's Queen Elizabeth II and Pope John Paul II meet at the Vatican Tuesday, Oct. 17, 2000. The British Royals, on a four-day official visit to Italy, after seeing the Pope, are scheduled to visit the Sistine Chapel, inside the Vatican. The Queen first met the Pope on a previous visit to the Vatican in 1980. (AP Photo/Alessandro Bianchi, Pool)

Britain's Queen Elizabeth II and Pope John Paul II exchange gifts at the Vatican Tuesday, Oct. 17, 2000. The Queen is showing the pontiff a collection of 50 of Canaletto's prints that came from her private library at Windsor. The British Royals, on a four-day official visit to Italy, after seeing the Pope, are scheduled to visit the Sistine Chapel, inside the Vatican.The Duke of Edinburgh Prince Philip is standing at center in the background. (AP Photo/Alessandro Bianchi, Pool)

KING'S LYNN, ENGLAND - FEBRUARY 05: Queen Elizabeth II smiles as she leaves the Sunday Service at West Newton Church on February 5, 2012 in King's Lynn, England. Monday 6th February will be Accession Day when the will Queen celebrate 60 years to the day that she became Monarch. (Photo by Chris Jackson - WPA Pool/Getty Images)

(FILES) Picture dated 20 May 1998 showing Britain's Queen Elizabeth II with one of the Corgi's she has bred. Britain's royals were gathering at their country retreat 24 December 2003 for Christmas as Queen Elizabeth II mourned the death of one of her beloved corgis, reportedly killed by her daughter's dog. AFP PHOTO (Photo credit should read STR/AFP/Getty Images)

KING'S LYNN, ENGLAND - FEBRUARY 05: Queen Elizabeth II is handed flowers as she leaves the Sunday Service at West Newton Church on February 5, 2012 in King's Lynn, England. Monday 6th February will be Accession Day, when the Queen will celebrate 60 years to the day that she became Monarch. (Photo by Chris Jackson - WPA Pool/Getty Images)

A Vatican Swiss Guard, right foreground, looks over his shoulder as Queen Elizabeth II walks through the corridors of the Vatican accompanied by Bishop James Harvey, left, before meeting Pope John Paul II, Tuesday, Oct. 17, 2000. Behind the Queen, background left, is her husband Prince Philip, Duke of Edinburgh. The British Royals, on a four-day official visit to Italy, after seeing the Pope, are scheduled to visit the Sistine Chapel, inside the Vatican. (AP Photo/Arturo Mari)

Queen Elizabeth II leans to pet a group of corgi dogs as she leaves the Alberta Legislature in Edmonton, Alberta Tuesday, May 24, 2005. The Queen is in Alberta to celebrate the province's centennial. (AP Photo/Paul Chiasson, CP)

Britain's Queen Elizabeth II and Pope Benedict XVI . walk through the gardens at the Palace of Holyroodhouse in Edinburgh, Scotland Thursday Sept. 16, 2010. The Pope is on a four day visit to Britain. (AP Photo/Dylan Martinez, Pool)

India's Prime Minister Manmohan Singh, left, speaks with Britain's Queen Elizabeth II at a banquet for Commonwealth heads of government in Port-of-Spain, Trinidad and Tobago, Friday, Nov. 27, 2009. At right is Prince Philip Duke of Edinburgh and behind is Commonwealth Secretary General Kamalesh Sharma. (AP Photo/Fernando Llano)

** EMBARGOED: NOT FOR PUBLICATION BEFORE 2301GMT THURSDAY APRIL 20, 2006 ** Britain's Queen Elizabeth II sits in the Regency Room at Buckingham Palace in London, Thursday April 19, 2006, as she looks at some of the cards which have been sent to her for her 80th birthday, which she celebrates on April 21. According to Buckingham Palace, the Queen has so far received 20,000 cards and 17,000 emails.(AP Photo/Fiona Hanson, pool)

Queen Elizabeth II smiles as she is escorted by community leader Ziggy Soul, right, while visiting the Hugh Sherlock Community Center in Kingston, Jamaica Tuesday, Feb. 19, 2002. The queen is on a three-day visit to Jamaica in celebration of her jubilee year. (AP Photo/Lynne Sladky)

Queen Elizabeth II chats with Prince Philip at the 133rd Kentucky Derby at Churchill Downs in Louisville, Ky., Saturday, May 5, 2007. (AP Photo/Rob Carr)

WINDSOR, UNITED KINGDOM - JULY 20: Queen Elizabeth II smiles as she is shown an orphaned cygnet at Oakley Court on the river bank during a swan upping census on the River Thames on July 20, 2009 near Windsor, England. During the ancient annual ceremony the Swan Marker leads a team of Swan Uppers on a five-day journey along the River Thames from Sunbury-on-Thames through Windsor to Abingdon counting, marking and checking the health of all unmarked swans. (Photo by Sang Tan - WPA Pool/Getty Images)

Britain's Queen Elizabeth II talks with France's first lady Carla Bruni-Sarkozy, during welcoming ceremonies at Windsor Castle in Windsor, England, Wednesday March 26, 2008, at the start of a two-day State Visit to Britain by French President Nicolas Sarkozy.(AP Photo/Kieran Doherty, pool)

Britain's Queen Elizabeth II, right, shares a laugh with the Director General of the Nigerian stock exchange, Dr. Noidi Okereke Onyiwke, in purple, at a reception at the State House in Abuja, Nigeria, Wednesday, which coincides with the 2003 Commonwealth Heads of Government meeting. (AP Photo/Nic Bothma, pool)

Britain's Queen Elizabeth II listens to Poland s chief rabbi, Menachem Joskowicz,right, at the Umschlagplatz Holocaust memorial in Warsaw Monday March 25, 1996. The memorial remembers the Holocaust's victims and was where trains loaded their victims for transport to the Nazi death camps. The queen is making the first visit to Poland by a British monarch, (AP Photo/Pool)

Britain's Prince Charles, with his wife Camilla, Duchess of Cornwall on his arm and his mother Britain's Queen Elizabeth II, stand outside St George's Chapel at Windsor Castle, Windsor, England, Saturday, April 9, 2005 after a service to bless the marriage of the newly married couple. Prince Charles and Camilla, Duchess of Cornwall, were married earlier in the day in a civil ceremony at the 17th century Guildhall in the royal town of Windsor, capping a decades-long romance that survived scrutiny, scandal and the prince's first marriage to Princess Diana. (AP Photo/Odd Andersen/WPA pool)

Britain's Queen Elizabeth II, right, is presented with flowers by a Maori girl, 7-year-old Ebony Murray, during a visit to Burnham military camp, south of Christchurch, New Zealand Monday, Feb. 25, 2002. The queen is in New Zealand on a five-day official visit, her 10th to the country. (AP Photo/Ross Land/Fotopress)

Britain's Queen Elizabeth II and the Duke of Edinburgh make their way in procession through the Royal Gallery to the Chamber at the Palace of Westminster, London, Wednesday, Nov. 17, 1999. The Queen delivered an address to both Houses of Parliament to mark the State Opening of Parliament. (AP Photo/Christine Nesbitt/Pool)

FILE--Britain's Queen Elizabeth II makes a speech in London, May 6, 1995. While Britain s news media frantically debate the divorce of Prince Charles and Princess Diana and wonder whether monarchy is doomed, Parliament is strangely silent even though it oversees the crown. The topic of the monarchy is so sensitive it has forced Labor s Blair and Prime Minister John Major to agree on at least one thing: Neither wants a parliamentary debate on it..(AP Photo/Lynne Sladky) UNUSED

Britain's Queen Elizabeth II toasts in the new millennium, at the Millennium Dome in Greenwich, southeast London, Saturday Jan. 1, 2000. (AP Photo/WPA, Arthur Edwards)

Britain's Queen Elizabeth II, right, and Prime Minister P.J. Patterson, attend a reception in the garden of the Governor General's house, in Kingston, Jamaica, on Monday, Feb. 18, 2002 at the start of her Jubilee tour. (Ap Photo/PA, Fiona Hanson) UNITED KINGDOM OUT NO SALES MAGAZINES OUT

U.S. Federal Reserve Chairman Alan Greenspan, right, is given his honorary knighthood from Britain's Queen Elizabeth II, left, with his wife Andrea Mitchell at his side at Balmoral castle in the Scottish Highlands, Thursday Sept. 26, 2002. (AP Photo/PA, David Cheskin, POOL)

Queen Elizabeth II and Vice President Dick Cheney tour the Jamestown Settlement in Williamsburg, Va., Friday May 4, 2007. (AP Photo/Lisa Billings)

British Queen Elizabeth II smiles after she arrived at Berlin airport Tegel on Monday, July 17, 2000. She will take part in the opening ceremony of the new British embassy in Berlin Tuesday. (AP Photo/Markus Schreiber)

Britain's Queen Elizabeth II, right, and Prince Philip, left, stand with Mexico's President Felipe Calderon and first lady Margarita Zavala in Buckingham Palace in London, Monday, March 30, 2009, before the state banquet during the State Visit of the President to London. (AP Photo/Stephen Hird/pool)

[BRITAIN ROYALS]Britain's Queen Elizabeth II inspects Thursday, June 5, 1997 her oldest bodyguard, The Yeomen of the Guard, created by Henry VII in 1485, on the grounds of London's Buckingham Palace. The Queen is accompanied by Lieutenant of the Yeomen of the Guard, Col. Greville Tufnell, left, and Lord McIntosh Captain of the Yeoman of the Guard, second from left, who by tradition, is the Government Deputy Chief Whip in the House of Lords. (AP Photo/John Stillwell, Pool)

Britain's Queen Elizabeth II, wearing a hat adorned with pheasant feathers, is accompanied by her husband the Duke of Edinburgh, right, during her visit to the new Faculty of Divinity, at the University of Cambridge, England Thursday Nov. 23, 2000. (AP Photo/FIndlay Kember, Pool)

A group of youngsters watch as Britain's Queen Elizabeth II is greeted by 'Bob the Builder' a children's entertainment character, during a visit to the offices of Hit entertainment, his creators, in London, Wednesday July 13, 2004.The Queen was spending a day with winners of The Queen's Award for Enterprise.(AP Photo/Fiona Hanson/pool)

FILE--Britain's Queen Elizabeth II, left and the Queen Mother are seen on the occassion of the Queen Mother's 96th birthday August 4, 1996 outside Sandringham church, Norfolk, eastern England. Buckingham Palace confirmed Monday, August 19, 1996 that the Queen is holding wide-ranging talks about the future of Britain's 1,200-year-old monarchy. (AP Photo/John Stillwell)

Britain's Queen Elizabeth II and Prince Charles are followed by Princess Eugenie, rear left, and Princess Beatrice, while visiting the Castle of Mey, former summer home of Queen Elizabeth, the Queen Mother, at Scrabster, Scotland, Monday Aug. 2, 2010, with other members of the royal family. They had been aboard the yacht Hebridean Princess for a private family holiday with the Queen, sailing around the Western Isles of Scotland.(AP Photo/Andrew Milligan-pa) **UNITED KINGDOM OUT: NO SALES: NO ARCHIVE: **

Britain's Queen Elizabeth II and her husband, the Duke of Edinburgh arrive for the first day of racing at the Royal Ascot meeting at Ascot racecourse 20 miles west of London Tuesday, June 20, 2000. The Royal Ascot meeting is famed for its fashions as much as for the horse racing. (AP Photo/Fiona Hanson) UNITED KINGDOM OUT: MAGAZINES OUT: NO SALES

Britain's Queen Elizabeth II and the Duke of Edinburgh, left, with US President George Bush and his wife Laura, behind, in St George's Hall, Windsor Castle Sunday June 15, 2008. Heading into two days of talks, U.S. President George W. Bush and British Prime Minister Gordon Brown plan to swap strategies on how to reduce their military forces in Iraq and halt Iran's nuclear ambitions. The two leaders will also discuss Middle East peace, climate change, trade and Northern Ireland governance, Bush's national security adviser Stephen Hadley told reporters traveling with the president on Sunday. (AP Photo / Dominic Liplinski, Pool)

Britain's Queen Elizabeth II, left, tosses a puck as Slovak President Ivan Gasparovic, right, looks on ahead of friendly ice-hockey match between HK Aquacity SKP Poprad Slovakia, right, and Guildford Flames Ice Hockey Club, England, left, in Poprad, central Slovakia, on Friday, Oct. 24, 2008. Elizabeth II and Prince Philip visit Slovakia Oct. 23-24 to pay their first-ever visit to the country at the invitation of the Slovak President. (AP Photo/CTK, Jak Koller) ** SLOVAKIA OUT **

FILE--Britain's Queen Elizabeth II is shown in this Dec. 6, 2000, file photo in London. Students from 37,000 British schools will compete to pay poetic tribute to Queen Elizabeth II during celebrations marking her 50 years on the throne, the nation's poet laureate, Andrew Motion, announced. (AP Photo/Max Nash, File)

Britain's Prince Charles salutes and Queen Elizabeth II looks on as the coffin of the Queen Mother is put into a hearse following funeral services in Westminster Abbey, London, Tuesday, April 9, 2002. At left, background, is Prince William. At rear, second from left, is Prince Edward. (AP Photo/Santiago Lyon, POOL)

US President George W. Bush (L) and First Lady Laura Bush (R) walk along the South Terrace with Queen Elizabeth II before departing the Palace aboard Marine One at Buckingham Palace 21 November 2003 in London, England. Bush is finishing a four-day state visit to Britain today and will return to Washington this evening. AFP PHOTO / TIM SLOAN (Photo credit should read TIM SLOAN/AFP/Getty Images)

Queen Elizabeth II and her husband Prince Philip (C) are greeted by French Prime Minister Jean-Pierre Raffarin (R) as they arrive for lunch at Hotel Matignon in Paris 06 April 2004, on the second day of a three-day state visit to mark the centenary of the Entente Cordiale, the colonial-era promise of cross-channel friendship between Britain and France. AFP PHOTO/JACK GUEZ (Photo credit should read JACK GUEZ/AFP/Getty Images)

Queen Elizabeth II passes a model of Buckingham Palace at Legoland in Windsor, 10 June 2003. The Queen, along with other members of the Royal Family were celebrating a day of British Tourism. The Queen's visit to Legoland included a walk through Mini-Land viewing models of central London. AFP PHOTO/Dave Caulkin WPA/POOL (Photo credit should read DAVE CAULKIN/AFP/Getty Images)

Queen Elizabeth II is followed by Wayne Gretzky past a row of amateur hockey players who provide the traditional greeting by banging their sticks on the ice during a ceremony at GM Place in Vancouver, British Columbia, Sunday Oct. 6, 2002. The Queen dropped the puck during a ceremonial face off at center ice prior to an NHL pre-season game between the Vancouver Canucks and the San Jose Sharks. (AP PHOTO/CP, Chuck Stoody)

Queen Elizabeth II smiles after cutting a cake representing the Alberta Legislature during rainy Alberta centennial celebrations at Commonwealth Stadium Monday, May 23, 2005 in Edmonton. (AP PHOTO/CP, Paul Chiasson)

Queen Elizabeth II, center, leans over to talks to Porsha Rogers, 8, left, and nurse Jaclyn Ivanoff, right, during her visit to Children's National Medical Center in Washington, Tuesday, May 8, 2007. Rogers wore a tiara for the occasion. (AP Photo/Pablo Martinez Monsivais/POOL)

FILE- Britain's Queen Elizabeth II smiles during her tour of Rome's Capitoline Hill in this Oct. 18, 2000, file photo. Queen Elizabeth II made a last stop to view 'The Last Supper' Thursday, Oct. 19, 2000, to wrap up a four-day official visit to Italy, where she was welcomed by leaders of church and state and serenaded at La Scala. (AP Photo/Domenico Stinellis, File)

Canadian rock star Bryan Adams chats with Queen Elizabeth II during a reception at GM Place in Vancouver Sunday Oct. 6, 2002. The Queen dropped the puck during a ceremonial face-off at a pre-season NHL game between the Vancouver Canucks and San Jose Sharks. (CP PHOTO/ Macleans/ Peter Bregg/ POOL)

First Lady Laura Bush, left, Queen Elizabeth II, second from right, and President Bush, right, wave from the balcony at the White House during the official state arrival ceremony in Washington Monday, May 7, 2007. Prince Philip is second from left. (AP Photo/Ron Edmonds)

NASA Administrator Michael Griffin, right, escorts Queen Elizabeth II during her tour of the NASA Goddard Space Flight Center in Greenbelt, Md., Tuesday, May 8, 2007. (AP Photo/Marvin Joseph, Washington Post, Pool)

Britain's Queen Elizabeth II accompanies U.S. President George W. Bush during a tour of the Queen's picture gallery inside Buckingham Palace in London, Wednesday Nov. 19, 2003, where they viewed letters and memorabilia relating to previous Royal vists to America. (AP Photo/Jim Watson/WPA pool)

ADDS JAMES MIDDLETON - In this photo provided by Clarence House on Saturday, April 30 2011, Britain's Prince William, center left, and his wife Kate, Duchess of Cambridge, center right, pose for a group photograph with, from back row left, Master Tom Pettifer, Camilla, Duchess of Cornwall, Prince Charles, Prince Harry, Michael Middleton, Carole Middleton, James Middleton, Philippa Middleton, and front row from left, Grace van Cutsem, Eliza Lopes, Prince Philip, Queen Elizabeth II, Margarita Armstrong-Jones, Lady Louise Windsor, and William Lowther-Pinkerton in the Throne Room at Buckingham Palace, following their wedding at Westminster Abbey, London, Friday, April 29, 2011. (AP Photo/Hugo Burnand, Clarence House) EDITORIAL USE ONLY

401683 02: Britain's Queen Elizabeth II officially opens the new Tanunda Lutheran Home February 28, 2002 in Barossa Valley, Australia. The queen will also open the Commonwealth Heads of Government meeting in Coolum, Queensland, as part of her five day visit to Australia. (Pool Photo/Getty Images)

(FILES) In this file handout picture released by the Emirati news agency WAM Emirati Minister of State Reem al-Hashemi (C) and cultural guide Fatima al-Melhi (L) speaking to Britain's Queen Elizabeth II as Emirati Crown Prince Sheikh Mohammed bin Zayed al-Nahayan (2nd-R) chats with Prince Andrew, Duke of York, during a visit to the Sheikh Zayed Grand Mosque in the Emirati capital of Abu Dhabi on November 24, 2010. Queen Elizabeth II, who on february 6, 2012 marks exactly 60 years on the throne, has spent a lifetime upholding her pledges to serve her peoples, earning a reputation in the process for calm shrewdness. When she ascended to the throne in 1952 aged just 25, Winston Churchill was prime minister of Britain, Jawaharlal Nehru led the newly-independent India and swathes of Africa and Asia were still governed by Britain. AFP PHOTO/HO/WAM == RESTRICTED TO EDITORIAL USE == (Photo credit should read HO/AFP/Getty Images) R:\Merlin\Getty_Photos\508621732.jpg

LONDON - JANUARY 14: Britain's Queen Elizabeth II leaves King Edward VII hospital with a cane and an aid after a knee operation January 14, 2003 in London. The queen, who stayed in hospital for the first time since 1982, underwent successful surgery to remove torn cartilage from her right knee. (Photo by Ian Waldie/Getty Images)

** FILE ** Queen Elizabeth II leaves the Macmillan Treatment Center on the 50th anniversary of her accession to the throne at the Queen Elizabeth Hospital in Kings Lynn, England, Wednesday, Feb. 6, 2002. Queen Elizabeth II underwent a successful operation Monday Jan. 13, 2003, to remove torn cartilage from her right knee Buckingham Palace said. (AP Photo/Dave Caulkin)

FILE: Britain's Queen Elizabeth The Queen Mother, second from left, stands with her daughters, Queen Elizabeth II, and Princess Margaret, right, and other members of the royal family, outside her residence, Clarence House, in central London, in this Aug. 4, 1999 file photo, where she was celebrating her 99th birthday. Others are, from left: Prince Andrew, The Countess of Wessex, Prince Charles, Prince Edward, partly hidden, Prince William, an unidentified aide, Peter Phillips, Prince Harry, Prince Philip and Princess Anne. The Queen Mother, one of the best-loved members of the Royal Family, died Saturday, March 30, 2002, at the age of 101. (AP Photo/Dave Caulkin)

Britain's Queen Elizabeth II passes her grandson Prince William, as she inspects graduates during a passing out parade at the Royal Military Academy Sandhurst, near Camberley, England, Friday Dec. 15, 2006. Prince William was amongst the graduates to pass out, and received a commission in the Blues and Royals, a regiment of the Household Cavalry. (AP Photo/Lewis Whyld, pool)

Britain's Queen Elizabeth II, right, stands with nephew Viscount Linley, center, and niece Lady Sarah Chatto as they watch the coffin of Princess Margaret leaves St George's Chapel in Windsor Castle, Windsor, England, Friday Feb. 15, 2002. Margaret died last Saturday at the age of 71. She was the younger sister of the queen and mother of Linley and Chatto. (AP Photo/Ian Jones/pool)

British Queen Elizabeth II talks to Berlin school children during a walk in front of the German Reichstag in Berlin Tuesday, July 18, 2000. Earlier, the British Quuen and Prince Philip took part in the opening ceremony of the new British Embassy in Berlin. (AP Photo/Roberto Pfeil)

Britain's Queen Elizabeth II, laughs as she leaves St. George's Chapel in Windsor, England, after the wedding of her youngest son Prince Edward to Sophie Rhys-Jones, Saturday, June 19, 1999. Thousands lined the streets of this small town to celebrate the union of the new Earl of Wessex, the title the queen gave him as a wedding gift, and a radiant Miss Rhys-Jones, hereafter to be known as Her Royal Highness the Countess of Wessex. (AP Photo/Ian Waldie, Pool)

Britain's Queen Elizabeth II greets crowds outside the new Norfolk Police Headquarters prior to opening the facility in Wymondham, Norfolk, eastern England, Tuesday Feb. 5, 2002. Wednesday is the 50th anniversary of Elizabeth II's accession to the British throne. (AP Photo/Dave Caulkin)

Britain's Queen Elizabeth II visits the Royal Air Force base in Marham, England, Wednesday Jan. 30, 2002, during the first public engagement of her Jubilee year. (AP Photo/Andrew Parsons)

Britain's Queen Elizabeth II, left, stands with her mother, Queen Elizabeth, on the steps of London's St. Paul's Catherdral, Tuesday, July 11, 2000. European royalty gathered Tuesday at St. Paul's Cathedral for a service of thanksgiving for the life of Queen Mother Elizabeth, who celebrates her 100th birthday next month. (AP Photo/Alastair Grant)

FILE -- Britain's Queen Elizabeth II smiles to band member's families after inspecting the civilian Streetsville Pipes and Drums band from Mississauga, Ontario, Canada, as they paraded on the lawn of Balmoral Castle, Scotland, in this Aug. 11, 2000 file photo. Britain's Queen Elizabeth II celebrates her 75th birthday on Saturday, April 21, 2001. (AP Photo/PA,Ben Curtis)UK OUT: MAGAZINES OUT: NO SALES**

British Queen Elizabeth II walks amid cheering children after opening The Anthony de Rothschild Building, the new business center of Buckingham University in southern England Friday, July 26, 1996. Roman Catholic theologian William Oddie sparked an outcry with an article in the Catholic Herald newspaper accusing the Queen of setting aside Christian values in her insistence on her son's divorce from Princess Diana. (AP Photo/David Giles) UNUSED

From left, Princess Eugenie, Prince William, Queen Elizabeth II, Prince Philip, Prince Charles on the balcony of Buckingham Palace after they took part in the annual Trooping the Colour ceremony in London, Saturday June 16, 2007. (AP Photo/Alastair Grant)

Britain's Queen Elizabeth II arrives for the second day of the Royal Ascot horse racing meeting in Ascot, England, Wednesday June, 18, 2008. The annual Royal Ascot horse race meeting spread over five days is one of the highlights of the English social season. (AP Photo/Alastair Grant)

Members of the British Royal family - Queen Elizabeth II; her eldest son, the Prince of Wales, Charles, left; his eldest son, Prince William, second left, and the Queen's husband Prince Philip, the Duke of Edinburgh, right, pose for a photograph at Clarence House in London, Monday June 2, 2003, before a dinner to mark the 50th anniversary of her Coronation. The Prince of Wales was hosting the meal at his new residence, formerly the London home of the late Queen Mother. (AP Photo/Kirsty Wigglesworth /WPA Pool)

Britain's Queen Elizabeth II waves to the crowd as she arrives in the Royal Box in the gardens of Buckingham Palace Monday June 3, 2002, during the second concert to commemorate her Golden Jubilee. (AP Photo/WPA, Stephen Hird)

Britain's Queen Elizabeth II and Prince Philip attend a service of celebration for their diamond wedding anniversary at Westminster Abbey in London, Monday Nov. 19, 2007. Behind the Queen are, first row, from left; Prince Charles, the Duchess of Cornwall, Prince Edward and Prince Harry, and at rear, Prince Andrew.(AP Photo/Alastair Grant, pool)