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Guests await the arrival of Queen Elizabeth II during a garden party at Buckingham Palace on May 29, 2012, in London.
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Queen Elizabeth II and Prince Philip, Duke of Edinburgh, stand for the national anthem as they attend a garden party at Buckingham Palace on May 29, 2012, in London.
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Kate, Duchess of Cambridge, Camilla, Duchess of Cornwall, Princess Anne and Prince Charles attend a garden party at Buckingham Palace on May 29, 2012, in London.
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Kate, Duchess of Cambridge, left, and Camilla, Duchess of Cornwall, attend a garden party at Buckingham Palace in London on May 29, 2012.
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From top left, Prince Charles, Camilla, Duchess of Cornwall, Princess Anne, Kate, Duchess of Cambridge, Prince Edward and Sophie, Countess of Wessex, walk to meet guests at the Buckingham Palace garden party in London on May 29, 2012, ahead of the main weekend of celebrations to mark the Diamond Jubilee of Britain's Queen Elizabeth II.
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Kate, Duchess of Cambridge, attends the Buckingham Palace garden party in London on May 29, 2012, ahead of the main weekend of celebrations to mark the Diamond Jubilee of Queen Elizabeth II.
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Kate, Duchess of Cambridge, meets guests during a garden party at Buckingham Palace on May 29, 2012, in London.
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Britain's Queen Elizabeth II, center, meets guests at the Buckingham Palace garden party in London on May 29, 2012, ahead of the main weekend of celebrations to mark her Diamond Jubilee.
CARL COURT/AFP/Getty Images
Kate, Duchess of Cambridge, center, meets guests at the Buckingham Palace garden party in London on May 29, 2012, ahead of the main weekend of celebrations to mark the Diamond Jubilee of Queen Elizabeth II.
Anthony Devlin - WPA Pool/Getty Images
Queen Elizabeth II meets guests during a garden party at Buckingham Palace on May 29, 2012, in London.
CARL COURT/AFP/Getty Images
Guests attend the Buckingham Palace garden party in London on May 29, 2012, ahead of the main weekend of celebrations to mark the Diamond Jubilee of Britain's Queen Elizabeth II.
CARL COURT/AFP/Getty Images
Kate, Duchess of Cambridge, center, meets guests at the Buckingham Palace garden party in London on May 29, 2012, ahead of the main weekend of celebrations to mark the Diamond Jubilee of Britain's Queen Elizabeth II.
AP Photo/Anthony Devlin - Pool
Queen Elizabeth II meets guests during a garden party at Buckingham Palace, in London on May 29, 2012.
Anthony Devlin - WPA Pool/Getty Images
Prince Charles meets a guest during a garden party at Buckingham Palace on May 29, 2012, in London.
Carl Court - WPA Pool/Getty Images
Kate, Duchess of Cambridge, right, meets guests at the Buckingham Palace garden party on May 29, 2012, in London, ahead of the main weekend of celebrations to mark the Diamond Jubilee of Britain's Queen Elizabeth II.
Anthony Devlin - WPA Pool/Getty Images
Prince Philip, Duke of Edinburgh, meets guests during a garden party at Buckingham Palace on May 29, 2012, in London.
Anthony Devlin - WPA Pool/Getty Images
Camilla, Duchess of Cornwall, front right, and Kate, Duchess of Cambridge, right, meet guests during a garden party at Buckingham Palace on May 29, 2012, in London.
Anthony Devlin - WPA Pool/Getty Images
Queen Elizabeth II meets guests during a garden party at Buckingham Palace on May 29, 2012, in London. (Photo by )
AP Photo/Anthony Devlin - Pool
Britain's Queen Elizabeth II attends a garden party at Buckingham Palace, in London, May 29, 2012.
Anthony Devlin - WPA Pool/Getty Images
Kate, Duchess of Cambridge, meets guests during a garden party at Buckingham Palace on May 29, 2012, in London.
Anthony Devlin - WPA Pool/Getty Images
Kate, Duchess of Cambridge, laughs as she meets Bethan Haynes, third left, during a garden party at Buckingham Palace on May 29, 2012, in London.
CARL COURT/AFP/Getty Images
Kate, Duchess of Cambridge, right, meets guests at the Buckingham Palace garden party in London on May 29, 2012, ahead of the main weekend of celebrations to mark the Diamond Jubilee of Queen Elizabeth II.
CARL COURT/AFP/Getty Images
Kate, Duchess of Cambridge, left, meets guests at the Buckingham Palace garden party in London on May 29, 2012, ahead of the main weekend of celebrations to mark the Diamond Jubilee of Britain's Queen Elizabeth II.