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HAMBURG, GERMANY - JULY 21: Prince William, Duke of Cambridge, Prince George of Cambridge, and Princess Charlotte of Cambridge depart from Hamburg airport on the last day of their official visit to Poland and Germany on July 21, 2017 in Hamburg, Germany. (Photo by Julian Simmonds - Pool/Getty Images)

HAMBURG, GERMANY - JULY 21: Prince William, Duke of Cambridge, Prince George of Cambridge, and Princess Charlotte of Cambridge depart from Hamburg airport on the last day of their official visit to Poland and Germany on July 21, 2017 in Hamburg, Germany.  (Photo by Julian Simmonds - Pool/Getty Images)