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Britain's Prince William, Duke of Cambridge, and his wife Catherine, Duchess of Cambridge, leave after attending with other members of the royal family the traditional Christmas Day Church Service at Sandringham in eastern England, on December 25, 2014. AFP PHOTO /PAUL ELLIS (Photo credit should read PAUL ELLIS/AFP/Getty Images)

Britain's Prince William, Duke of Cambridge, and his wife Catherine, Duchess of Cambridge, leave after attending with other members of the royal family the traditional Christmas Day Church Service at Sandringham in eastern England, on December 25, 2014. AFP PHOTO /PAUL ELLIS        (Photo credit should read PAUL ELLIS/AFP/Getty Images)