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(FILE PHOTO) In this composite image a comparison has been made between Prince William (L) and Prince George wearing similar clothing. ***LEFT IMAGE*** LONDON - SEPTEMBER 16: (FILE PHOTO) Prince William leaves St Mary's Hospital after visiting his newborn brother, Prince Harry, on September 16, 1984 in London, England. (Photo by Anwar Hussein/Getty Images) **RIGHT IMAGE*** KING'S LYNN, ENGLAND - JULY 05: Catherine, Duchess of Cambridge, Prince William, Duke of Cambridge, Princess Charlotte of Cambridge and Prince George of Cambridge arrive at the Church of St Mary Magdalene on the Sandringham Estate for the Christening of Princess Charlotte of Cambridge on July 5, 2015 in King's Lynn, England. (Photo by Chris Jackson/Getty Images)