Britain's Catherine, Duchess of Cambridge, (L) and Britain's Prince William, Duke of Cambridge, (R) stand together as they wait to see off Britain's Queen Elizabeth II after attending the Royal Family's traditional Christmas Day church service at St Mary Magdalene Church in Sandringham, Norfolk, eastern England, on December 25, 2017. / AFP PHOTO / Adrian DENNIS (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
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AFP ADRIAN DENNIS

Britain's Prince William, Duke of Cambridge, (L) and Britain's Catherine, Duchess of Cambridge, (R) greet well-wishers as they leave after attending the Royal Family's traditional Christmas Day church service at St Mary Magdalene Church in Sandringham, Norfolk, eastern England, on December 25, 2017. / AFP PHOTO / Adrian DENNIS (Photo credit should read ADRIAN DENNIS/AFP/Getty Images)
Getty Images

AFP ADRIAN DENNIS