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HEIDELBERG, GERMANY - JULY 20: Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge arrive at the last original dancehall in Berlin, the Clärchens Ballhaus, to attend a reception on day 2 of their official visit to Germany on July 20, 2017 in Berlin, Germany. (Photo by Chris Jackson - Pool/Getty Images)

HEIDELBERG, GERMANY - JULY 20:  Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge arrive at the last original dancehall in Berlin, the Clärchens Ballhaus, to attend a reception on day 2 of their official visit to Germany on July 20, 2017 in Berlin, Germany. (Photo by Chris Jackson - Pool/Getty Images)