Kate, 35, wore the ice blue Jenny Packham dress as she attended a dinner at the British Embassy in Paris as part of a two-day trip to France.
Detail of Kate Middleton's Tod's pumps.
That said, the royal couple stepped out for a public appearance at the St. Patrick's Day parade in London, and seemed perfectly chipper and at ease.
But while there may be some truth to this, Kate Middleton appeared to remain the dignified Duchess of Cambridge we know and love.
Britain's Prince William, Duke of Cambridge (C) and his wife Britain's Kate, Duchess of Cambridge (L) speak with a wounded soldier as they visit the military hospital at the Hotel des Invalides in Paris, on March 18, 2017.
A thick silver bracelet, ring and long earrings completed her look for the event, which was hosted by Her Majesty's Ambassador to France, Edward Llewellyn.
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Chicago Sun-Times reporter Steve Greenberg says the boy, 11-year-old John, is Northwestern Athletic Director Jim Phillips' son. It is what it is. "These guys are all my brothers, and I look at them as all my little bros, taking care of all of them".
In addition, Prince William and his friends also reportedly spent time with 24-year-old Australian model Sophie Taylor and a 30-year-old British former beautician named Rosie Peate. Kate Middleton kicked off her sartorial showcase at the Elysée Palace with a green Catherine Walker coat dress for a meeting with Francois Hollande. Oh, and then skipped the Commonwealth Day service on Monday.
They also took a trip to the Impressionist Gallery at the Musée d'Orsay, where they spoke to the curators about the gallery's collections which will be exhibited at the Tate Britain later this year.
"We think you are very strong and very fearless, you've made unbelievable progress", Prince William said, according to the BBC.
Britain's Prince William is taking flak for going on a ski holiday instead of attending a major royal engagement with his family.
In an interview previous year, he said he was aware of the criticism and was willing to take on more royal duties.
In a report from Vanity Fair, a source allegedly said that Princess Kate was "understandably less than pleased" at how her husband behaved that night.