PARIS, FRANCE - MARCH 17 : Prince William, Duke of Cambridge and Catherine,Duchess of Cambridge attend a reception at the British Embassy during day one of their visit on March 17, 2017 in Paris, France. (Photo by Ian Vogler - Pool/Getty Images)

PARIS, FRANCE - MARCH 17 : Prince William, Duke of Cambridge and Catherine,Duchess of Cambridge attend a reception at the British Embassy during day one of their visit on March 17, 2017 in Paris, France. (Photo by Ian Vogler - Pool/Getty Images)

PARIS, FRANCE - MARCH 17 : Prince William, Duke of Cambridge and Catherine,Duchess of Cambridge attend a reception at the British Embassy during day one of their visit on March 17, 2017 in Paris, France. (Photo by Ian Vogler - Pool/Getty Images)

PARIS, FRANCE - MARCH 17 : Prince William, Duke of Cambridge and Catherine,Duchess of Cambridge attend a reception at the British Embassy during day one of their visit on March 17, 2017 in Paris, France. (Photo by Ian Vogler - Pool/Getty Images)

PARIS, FRANCE - MARCH 17 : Prince William, Duke of Cambridge and Catherine,Duchess of Cambridge attend a reception at the British Embassy during day one of their visit on March 17, 2017 in Paris, France. (Photo by Ian Vogler - Pool/Getty Images)

PARIS, FRANCE - MARCH 17 : Prince William, Duke of Cambridge and Catherine,Duchess of Cambridge attend a reception at the British Embassy during day one of their visit on March 17, 2017 in Paris, France. (Photo by Ian Vogler - Pool/Getty Images)

PARIS, FRANCE - MARCH 17 : Prince William, Duke of Cambridge and Catherine,Duchess of Cambridge attend a reception at the British Embassy during day one of their visit on March 17, 2017 in Paris, France. (Photo by Ian Vogler - Pool/Getty Images)

PARIS, FRANCE - MARCH 17 : Prince William, Duke of Cambridge and Catherine,Duchess of Cambridge attend a reception at the British Embassy during day one of their visit on March 17, 2017 in Paris, France. (Photo by Ian Vogler - Pool/Getty Images)

PARIS, FRANCE - MARCH 17 : Prince William, Duke of Cambridge and Catherine,Duchess of Cambridge attend a reception at the British Embassy during day one of their visit on March 17, 2017 in Paris, France. (Photo by Ian Vogler - Pool/Getty Images)

PARIS, FRANCE - MARCH 17 : Prince William, Duke of Cambridge and Catherine,Duchess of Cambridge attend a reception at the British Embassy during day one of their visit on March 17, 2017 in Paris, France. (Photo by Ian Vogler - Pool/Getty Images)