PARIS, FRANCE - MARCH 17 : Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge visit French President Francois Hollande at the Elysee Palace on March 17, 2017 in Paris, France. (Photo by Patrick van Katwijk/Getty Images)

PARIS, FRANCE - MARCH 17 : Prince William, Duke of Cambridge and Catherine, Duchess of Cambridge visit French President Francois Hollande at the Elysee Palace on March 17, 2017 in Paris, France. (Photo by Patrick van Katwijk/Getty Images)