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LONDON, ENGLAND - DECEMBER 19: Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge and Prince Harry attend The Sun Military Awards at Imperial War Museum on December 19, 2011 in London, England. (Photo by Arthur Edwards - WPA Pool/Getty Images)

LONDON, ENGLAND - DECEMBER 19: Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge and Prince Harry attend The Sun Military Awards at Imperial War Museum on December 19, 2011 in London, England. (Photo by Arthur Edwards - WPA Pool/Getty Images)

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LONDON, UNITED KINGDOM - DECEMBER 19: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge greets Sir David Brewer, Lord-Lieutenant of Greater London, as she attends The Sun Military Awards at Imperial War Museum on December 19, 2011 in London, England. (Photo by Indigo/Getty Images)

LONDON, UNITED KINGDOM - DECEMBER 19: (EMBARGOED FOR PUBLICATION IN UK NEWSPAPERS UNTIL 48 HOURS AFTER CREATE DATE AND TIME) Catherine, Duchess of Cambridge greets Sir David Brewer, Lord-Lieutenant of Greater London, as she attends The Sun Military Awards at Imperial War Museum on December 19, 2011 in London, England. (Photo by Indigo/Getty Images)