Kate Middleton stuck to her winning combination of dresses by her favourite British designers, a crowd pleaser for her hosts and a recycled look on her recent visit to France.
The Duke and Duchess were greeted at the Élysée Palace by French President François Hollande.
In the world's fashion capital, Kate wore a sleeveless V-neck black dress by Alexander McQueen before changing into a gray-blue gown by British designer Jenny Packham later in the evening.
Earlier in the day, the royal couple attended a St. Patrick's Day parade in London, where Middleton, wearing a forest green Catherine Walker coat with matching Lock & Co. fascinator and Gianvito Rossi suede pumps, handed out sprigs of shamrocks to Battalion Irish Guards and drank Guinness with Prince William.
The royal couple also posed for photos with the soldiers.
Plus, they will meeta black-tie dinner to meet young French leaders in the arts, sports, military and business at a reception and a black-tie dinner.
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Kate emphasised her waist with a back Chanel double C belt and she also carried a small burgundy quilted leather top-handle Chanel bag.
Middleton, who stayed home with 3-year-old Prince George and 1-year-old Princess Charlotte, was reportedly not happy with her husband's behavior.
They toured the Impressionists Gallery at the Musee d'Orsay before watching a rugby match between France and Wales.
The two-day visit is Prince William's first official trip to the French capital since the tragic death of his mother Diana, the Princess of Wales, in a auto accident at the Pont de l'Alma tunnel two decades ago.
After their artistic stop, Will and Kate attended an event for "Les Voisins in Action" (or "Neighbors in Action") at the Trocadéro, where they met with a group of young people from both France and U.K. While at the event, the couple chatted with schoolchildren from the British Council's Somme project as well as members of young learners programs.