Credit: Samir Hussein/

One day, three dresses!

After turning heads in dresses by Roland Mouret and Erdem, Duchess Kate opted for a more casual look at an informal barbecue Thursday night in Ottawa.

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Wearing a black and white wrap dress by one of her favorite designers, Issa, the 29-year-old showed no signs of jet lag as she and Prince William entered Rideau Hall to 120 excited fans. See more pics of Middleton at Rideau Hall.

"Talk among yourselves," a cheeky William, 29, told the crowd. (He too dressed down, wearing an open-necked blue shirt and khaki pants.)

After the initial receiving line, the couple split up and moved around the room. When one of the guests asked the Duchess if she was tired from traveling, she replied, "We are fine, not too bad."

Tell Us: Is Duchess Kate's Issa dress her best look yet?