BERLIN, GERMANY - JULY 19: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge visit the Monument to the Murdered Jews of Europe, also known as the Holocaust Memorial, on the first day of their visit to Germany on July 19, 2017 in Berlin, Germany. The royal couple are on a three-day trip to Germany that includes visits to Berlin, Hamburg and Heidelberg. (Photo by Sean Gallup/Getty Images)
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Getty Images Entertainment Sean Gallup

BERLIN, GERMANY - JULY 19: Catherine, Duchess of Cambridge, and Prince William, Duke of Cambridge, visit the Monument to the Murdered Jews of Europe, also known as the Holocaust Memorial, on the first day of their visit to Germany on July 19, 2017 in Berlin, Germany. The royal couple are on a three-day trip to Germany that includes visits to Berlin, Hamburg and Heidelberg. (Photo by Michele Tantussi/Getty Images)
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Getty Images Entertainment Michele Tantussi

BERLIN, GERMANY - JULY 19: Catherine Duchess of Cambridge and Prince William Duke of Cambridge visit the Monument to the Murdered Jews of Europe, also known as the Holocaust Memorial, on the first day of their visit to Germany on July 19, 2017 in Berlin, Germany. The royal couple are on a three-day trip to Germany that includes visits to Berlin, Hamburg and Heidelberg. (Photo by Isa Foltin/Getty Images)
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German Select Isa Foltin

BERLIN, GERMANY - JULY 19: (NO UK SALES FOR 28 DAYS FROM CREATE DATE) Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge visit the Holocaust Memorial during an official visit to Poland and Germany on July 19, 2017 in Berlin, Germany. (Photo by Pool/Samir Hussein/WireImage)
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WireImage Pool/Samir Hussein