KING'S LYNN, ENGLAND - DECEMBER 25: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge arrive for the Christmas Day service at Sandringham on December 25, 2013 in King's Lynn, England. (Photo by Chris Jackson/Getty Images)
KING'S LYNN, ENGLAND - DECEMBER 25: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge arrive for the Christmas Day service at Sandringham on December 25, 2013 in King's Lynn, England. (Photo by Chris Jackson/Getty Images)