Prince Charles, Prince of Wales, Camilla, Duchess of Cornwall and Carole Middleton walk behind Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge, Princess Charlotte of Cambridge and Prince George of Cambridge leaving the Church of St Mary Magdalene on the Sandringham Estate after the christening of Princess Charlotte of Cambridge on July 5, 2015 in King&#x27;s Lynn, England. Princess Charlotte will remain fourth in line to the British throne regardless of whether the new royal baby is a boy or a girl.