Britain's Queen Elizabeth and Prince Philip leave from Chelsea Harbour in London on a launch on the first part of their journey in the Diamond Jubilee River Pageant Sunday June 3, 2012 . More than 1,000 boats will sail down the River Thames on Sunday in a flotilla tribute to Queen Elizabeth II's 60 years on the throne that organizers are calling the biggest pageant on the river for 350 years. (AP Photo/Eddie Mulholland, Pool)

Britain's Queen Elizabeth II smiles during the river pageant commemorating her Diamond Jubilee, on the River Thames in London, Sunday June 3, 2012. (AP Photo / Dylan Martinez, pool)

Hundreds of boats make their way down the River Thames past for British Royal Navy cruiser HMS Belfast towards Tower Bridge as they take part in the Thames River Pageant for the Queen's Diamond Jubilee celebrations in London,Sunday, June 3, 2012. More than 1,000 boats were to sail down the Thames on Sunday in a flotilla tribute to Queen Elizabeth II's 60 years on the throne that organizers are calling the biggest gathering on the river for 350 years. Despite cool, drizzly weather, hundreds of thousands of people are expected to line the riverbanks in London, feting the British monarch whose longevity has given her the status of the nation's favourite grandmother. (AP Photo/Alastair Grant)

Sue Ridley waits on Westminster Bridge for the Royal Barge to pass the House of Commons and the Big Ben clocktower during the Thames Diamond Jubilee River Pageant in London, Sunday, June 3, 2012. More than 1,000 boats were to sail down the Thames on Sunday in a flotilla tribute to Queen Elizabeth II's 60 years on the throne that organizers are calling the biggest gathering on the river for 350 years. Despite cool, drizzly weather, hundreds of thousands of people are expected to line the riverbanks in London, feting the British monarch whose longevity has given her the status of the nation's favorite grandmother. (AP Photo/Tim Hales)

Royal supporters sit on chairs with Union Jack decorations on the Mall outside Buckingham Palace in London, on June 4, 2012, in preparation for the Queen's Jubilee concert. A chain of more than 4,200 beacons began to flare across the globe on June 4 to mark Queen Elizabeth II's diamond jubilee, with the last to be lit by the monarch at a star-studded concert at Buckingham Palace. AFP PHOTO / BEN STANSALLBEN STANSALL/AFP/GettyImages

Royal supporters pose for a photo with Union Jack flags on the Mall outside Buckingham Palace in London, on June 4, 2012, in preparation for the Queen's Jubilee concert. A chain of more than 4,200 beacons began to flare across the globe on June 4 to mark Queen Elizabeth II's diamond jubilee, with the last to be lit by the monarch at a star-studded concert at Buckingham Palace. AFP PHOTO / BEN STANSALLBEN STANSALL/AFP/GettyImages

Royal supporter wearing Union Jack glasses smiles as she waits on the Mall outside Buckingham Palace in London, on June 4, 2012, in preparation for the Queen's Jubilee concert. A chain of more than 4,200 beacons began to flare across the globe on June 4 to mark Queen Elizabeth II's diamond jubilee, with the last to be lit by the monarch at a star-studded concert at Buckingham Palace. AFP PHOTO / BEN STANSALLBEN STANSALL/AFP/GettyImages

Royal supporters gather on the Mall outside Buckingham Palace in London, on June 4, 2012, in preparation for the Queen's Jubilee concert. A chain of more than 4,200 beacons began to flare across the globe Monday to mark Queen Elizabeth II's diamond jubilee, with the last to be lit by the monarch at a star-studded concert at Buckingham Palace. AFP PHOTO / ADRIAN DENNISADRIAN DENNIS/AFP/GettyImages

Royal supporters gather on the Mall outside Buckingham Palace in London, on June 4, 2012, in preparation for the Queen's Jubilee concert. A chain of more than 4,200 beacons began to flare across the globe Monday to mark Queen Elizabeth II's diamond jubilee, with the last to be lit by the monarch at a star-studded concert at Buckingham Palace. AFP PHOTO / ADRIAN DENNISADRIAN DENNIS/AFP/GettyImages

CANBERRA, AUSTRALIA - JUNE 04: Australian Prime Minister Julia Gillard and opposition Leader Tony Abbott jointly light a ceremonial beacon to mark the Queen's Diamond Jubilee at Parliament House on June 4, 2012 in Canberra, Australia. Around 4,200 beacons will be lit across the UK and commonwealth nations to mark the Queen's Diamond Jubilee, with the final national beacon being lit by the Queen on the Mall at the Jubilee Concert at Buckingham Palace. For only the second time in its history the UK celebrates the Diamond Jubilee of a monarch. Her Majesty Queen Elizabeth II celebrates the 60th anniversary of her ascension to the throne. Thousands of well-wishers from around the world have flocked to London to witness the spectacle of the weekend's celebrations. Yesterday the Queen along with all members of the royal family participated in a River Pageant with a flotilla of a 1,000 boats accompanying them down the Thames. (Photo by Andrew Taylor/Getty Images)

LONDON, ENGLAND - JUNE 03: Queen Elizabeth II (C) stands in front of Prince Harry, Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge on the royal barge 'Spirit of Chartwell' during the Thames Diamond Jubilee Pageant on the River Thames on June 3, 2012 in London, England. For only the second time in its history the UK celebrates the Diamond Jubilee of a monarch. Her Majesty Queen Elizabeth II celebrates the 60th anniversary of her ascension to the throne. Thousands of well-wishers from around the world have flocked to London to witness the spectacle of the weekend's celebrations. The Queen along with all members of the royal family will participate in a River Pageant with a flotilla of a 1,000 boats accompanying them down The Thames, the star studded free concert at Buckingham Palace, and a carriage procession and a service of thanksgiving at St Paul's Cathedral. (Photo by Adrian Dennis - WPA Pool/Getty Images)

The Royal barge, 'Spirit of Chartwell' carrying Britain's Queen Elizabeth II takes part in the Thames Diamond Jubilee Pageant in London, on June 3, 2012. Hundreds of rowing boats, barges and steamers filled the River Thames with a blaze of colour on Sunday as Queen Elizabeth II sailed through London as part of her spectacular diamond jubilee pageant. TOPSHOTS/AFP PHOTO/SUZANNE PLUNKETT/POOLSUZANNE PLUNKETT/AFP/GettyImages

Spectators standing on a balcony cheer with Britain's Union flags during the Thames Diamond Jubilee river Pageant in London on June 3, 2012, as Britain celebrates the Queen's Diamond Jubilee River Pageant. Queen Elizabeth II is to sail on a ceremonial barge down the Thames at the centre of a 1,000-boat pageant to mark her diamond jubilee, although heavy rain threatened to spoil the party. TOPSHOTS/AFP PHOTO/MIGUEL MEDINAMIGUEL MEDINA/AFP/GettyImages

Britain's Queen Elizabeth II waves from the royal barge 'Spirit of Chartwell' as it sails past the Houses of Parliament during the Thames during the Thames Diamond Jubilee Pageant on the River Thames in London on June 3, 2012. Queen Elizabeth II was to sail on a ceremonial barge down the Thames on Sunday at the centre of a 1,000-boat pageant to mark her diamond jubilee, although heavy rain threatened to spoil the party. TOPSHOTS/AFP PHOTO/POOL/JOHN STILLWELLJOHN STILLWELL/AFP/GettyImages

The Royal barge, 'Spirit of Chartwell' (C) carrying Britain's Queen Elizabeth II takes part in the Thames Diamond Jubilee Pageant in London, on June 3, 2012. Hundreds of rowing boats, barges and steamers filled the River Thames with a blaze of colour on Sunday as Queen Elizabeth II sailed through London as part of her spectacular diamond jubilee pageant. AFP PHOTO / PAUL HACKETT/POOLPAUL HACKETT/AFP/GettyImages

Fireworks are fired from Tower Bridge marking the end of the Diamond Jubilee River Pageant on the River Thames in London on June 3, 2012. Queen Elizabeth II sailed on a ceremonial barge down the Thames at the centre of a 1,000-boat pageant to mark her diamond jubilee, although heavy rain threatened to spoil the party. AFP PHOTO / POOL / PETER MACDIARMIDPETER MACDIARMID/AFP/GettyImages

LONDON, ENGLAND - JUNE 03: A woman near Tower Bridge waves while wearing a mask of Queen Elizabeth II during the Diamond Jubilee Thames River Pageant on June 3, 2012 in London, England. For only the second time in its history the UK celebrates the Diamond Jubilee of a monarch. Her Majesty Queen Elizabeth II celebrates the 60th anniversary of her ascension to the throne. Thousands of well-wishers from around the world have flocked to London to witness the spectacle of the weekend's celebrations. The Queen along with all members of the royal family will participate in a River Pageant with a flotilla of a 1,000 boats accompanying them down the Thames. (Photo by Dylan Martinez - WPA Pool/Getty Images)

Ceremonial rosettes are displayed on the 'Havengore' at the beginning of the Thames Diamond Jubilee Pageant on the River Thames in London on June 3, 2012. Queen Elizabeth II sailed Sunday on a royal barge at the centre of a spectacular 1,000-boat river pageant on the Thames, the set-piece of celebrations to mark her diamond jubilee. AFP PHOTO / POOL / LEON NEALLEON NEAL/AFP/GettyImages

Princess Beatrice of York boards 'Havengore' during the Thames Diamond Jubilee Pageant on the River Thames in London on June 3, 2012. Queen Elizabeth II sailed Sunday on a royal barge at the centre of a spectacular 1,000-boat river pageant on the Thames, the set-piece of celebrations to mark her diamond jubilee. AFP PHOTO / POOL / LEON NEALLEON NEAL/AFP/GettyImages

Spectators line Westminster Bridge in London to catch a glimpse of Queen Elizabeth's Diamond Jubilee Pageant on June 3, 2012. Hundreds of rowing boats, barges and steamers filled the River Thames with a blaze of colour on Sunday as Queen Elizabeth II sailed through London as part of her spectacular diamond jubilee pageant. AFP PHOTO / Dan Kitwood/POOLDan Kitwood/AFP/GettyImages