HAMBURG, GERMANY - JULY 21: Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Prince George of Cambridge and Princess Charlotte of Cambridge view helicopter models H145 and H135 before departing from Hamburg airport on the last day of their official visit to Poland and Germany on July 21, 2017 in Hamburg, Germany. (Photo by Chris Jackson/Getty Images)
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Chris Jackson Collection Chris Jackson

HAMBURG, GERMANY - JULY 21: Prince William, Duke of Cambridge, Catherine, Duchess of Cambridge, Prince George of Cambridge and Princess Charlotte of Cambridge view helicopter models H145 and H135 before departing from Hamburg airport on the last day of their official visit to Poland and Germany on July 21, 2017 in Hamburg, Germany. (Photo by Chris Jackson/Getty Images)
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Chris Jackson Collection Chris Jackson

HAMBURG, GERMANY - JULY 21: Prince George of Cambridge departs from Hamburg airport on the last day of their official visit to Poland and Germany on July 21, 2017 in Hamburg, Germany. (Photo by Franziska Krug/Getty Images)
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German Select Franziska Krug

HAMBURG, GERMANY - JULY 21: (NO UK SALES FOR 28 DAYS FROM CREATE DATE) Princess Charlotte of Cambridge and Prince William, Duke 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 Pool/Samir Hussein/WireImage)
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WireImage Pool/Samir Hussein

HAMBURG, GERMANY - JULY 21: Princess Charlotte of Cambridge and Prince William, Duke of Cambridge view helicopter models H145 and H135 before departing from Hamburg airport on the last day of their official visit to Poland and Germany on July 21, 2017 in Hamburg, Germany. (Photo by Karwai Tang/WireImage)
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WireImage Karwai Tang