PARIS, FRANCE - MARCH 18:  Britain's Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge pose at Trocadero square in front of the Eiffel tower the Eiffel Tower on March 18, 2017 in Paris, France. The Duke and Duchess are on a two day tour of France.  (Photo by Laurent Vu - SC Pool - Corbis/Corbis via Getty Images)