Kate, the Duchess of Cambridge, leaves Clarence House to travel to Buckingham Palace for the evening celebrations following her wedding to Prince William earlier in the day. | JOHN STILLWELL/AFP/Getty Images

Kate, the Duchess of Cambridge (L) leaves Clarence House accompanied by the Camilla, the Duchess of Cornwall to travel to Buckingham Palace for the evening celebrations following her wedding to Prince William earlier in the day on April 29, 2011 in London. AFP PHOTO/WPA POOL/ John Stillwell (Photo credit should read JOHN STILLWELL/AFP/Getty Images)

Prince William, Duke of Cambridge, and Catherine, Duchess of Cambridge, leave Clarence House for Buckingham Palace Friday on the way to their evening wedding reception. | Getty Images

LONDON, UNITED KINGDOM - APRIL 29: Prince William, Duke of Cambridge (L) leaves Clarence House with his father Prince Charles, Prince of Wales to travel to Buckingham Palace for the evening celebrations following his wedding to Catherine, Duchess of Cambridge on April 29, 2011 in London, England. The marriage of the second in line to the British throne was led by the Archbishop of Canterbury and was attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding. (Photo by John Stillwell - WPA Pool/Getty Images)

Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, and Prince Charles, Prince of Wales, leave Clarence House to travel to Buckingham Palace for the evening celebrations. | Photo by John Stillwell - WPA Pool/Getty Images

LONDON, ENGLAND - APRIL 29: Princess Anne, Princess Royal and her husband Timothy Laurence leave Clarence House for Buckingham Palace on April 29, 2011 in London, England. The marriage of the second in line to the British throne was led by the Archbishop of Canterbury and was attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding. (Photo by Dan Kitwood/Getty Images)

LONDON, ENGLAND - APRIL 29: Zara Phillips and her fiance Mike Tindall leave Clarence House for Buckingham Palace on April 29, 2011 in London, England. The marriage of the second in line to the British throne was led by the Archbishop of Canterbury and was attended by 1900 guests, including foreign Royal family members and heads of state. Thousands of well-wishers from around the world have also flocked to London to witness the spectacle and pageantry of the Royal Wedding. (Photo by Dan Kitwood/Getty Images)