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PARIS, FRANCE - MARCH 18: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge speak with wounded soldiers as they visit the Invalides on March 18, 2017 in Paris, France. The Duke and Duchess are on a two day tour of France. (Photo by Pool/Samir Hussein/WireImage)

PARIS, FRANCE - MARCH 18:  Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge speak with wounded soldiers as they visit the Invalides on March 18, 2017 in Paris, France. The Duke and Duchess are on a two day tour of France.  (Photo by Pool/Samir Hussein/WireImage)

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PARIS, FRANCE - MARCH 18: Catherine, Duchess of Cambridge (C) greets a school kid at the Trocadero during an official two-day visit to Paris on March 18, 2017 in Paris, France. (Photo by Chris Jackson/Getty Images)

PARIS, FRANCE - MARCH 18:  Catherine, Duchess of Cambridge (C) greets a school kid at the Trocadero during an official two-day visit to Paris on March 18, 2017 in Paris, France.  (Photo by Chris Jackson/Getty Images)

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PARIS, FRANCE - MARCH 18: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge pose at the Trocadero in front of the Eiffel tower during an official two-day visit to Paris on March 18, 2017 in Paris, France. (Photo by Chris Jackson/Getty Images)

PARIS, FRANCE - MARCH 18:  Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge pose at the Trocadero in front of the Eiffel tower during an official two-day visit to Paris on March 18, 2017 in Paris, France.  (Photo by Chris Jackson/Getty Images)

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PARIS, FRANCE - MARCH 18: Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge look through the clock at Musee d'Orsay during an official two-day visit to Paris on March 18, 2017 in Paris, France. (Photo by Chris Jackson - Pool/Getty Images)

PARIS, FRANCE - MARCH 18:  Catherine, Duchess of Cambridge and Prince William, Duke of Cambridge look through the clock at Musee d'Orsay during an official two-day visit to Paris on March 18, 2017 in Paris, France.  (Photo by Chris Jackson - Pool/Getty Images)

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PARIS, FRANCE - MARCH 18: Catherine, Duchess of Cambridge visits a 'Les Voisins in Action' event highlighting the strong ties between the young people of France and the UK during an official two-day visit to Paris on March 18, 2017 in Paris, France. Their Royal Highnesses met local school children and students from the British Council's Somme project and young learners programmes, as well as young French rugby fans ahead of the RBS Six Nations match that afternoon. (Photo by Arthur Edwards-Pool/Getty Images)

PARIS, FRANCE - MARCH 18:  Catherine, Duchess of Cambridge visits a 'Les Voisins in Action' event highlighting the strong ties between the young people of France and the UK during an official two-day visit to Paris on March 18, 2017 in Paris, France. Their Royal Highnesses met local school children and students from the British Council's Somme project and young learners programmes, as well as young French rugby fans ahead of the RBS Six Nations match that afternoon. (Photo by Arthur Edwards-Pool/Getty Images)