LONDON, ENGLAND - DECEMBER 17: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend a Christmas Lunch at Buckingham Palace on December 17, 2014 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)
LONDON, ENGLAND - DECEMBER 17: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge attend a Christmas Lunch at Buckingham Palace on December 17, 2014 in London, England. (Photo by Mark Cuthbert/UK Press via Getty Images)