BERLIN, GERMANY - JULY 20:  Prince William, Duke of Cambridge, and Catherine, Duchess of Cambridge, attend a reception at Claerchen's Ballhaus dance hall following a day in Heidelberg on the second day of the royal visit to Germany on July 20, 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)