BERLIN, GERMANY - JULY 19: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge visit the Brandenburg Gate during an official visit to Poland and Germany on July 19, 2017 in Berlin, Germany. (Photo by Chris Jackson/Getty Images)
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BERLIN, GERMANY - JULY 19: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge visit the Brandenburg Gate during an official visit to Poland and Germany on July 19, 2017 in Berlin, Germany. (Photo by Chris Jackson/Getty Images)
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Chris Jackson Collection Chris Jackson

BERLIN, GERMANY - JULY 19: Prince William, Duke of Cambridge greets members of the public gathered at the Pariser Platz during a visit to the Brandenburg Gate during an official visit to Poland and Germany on July 19, 2017 in Berlin, Germany. (Photo by Cartsen Koall/Getty Images)
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BERLIN, GERMANY - JULY 19: Prince William, Duke of Cambridge greets well wishers on his arrival at the Brandenburg Gate during an official visit to Poland and Germany on July 19, 2017 in Berlin, Germany. (Photo by Julian Simmonds - Pool/Getty Images)
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