Jennifer Lawrence Calvin KleinGetty; LANDOV

Jennifer Lawrence was the It-Girl of the Oscars last night—not only for her Best Leading Actress win, but also for her fashion. After carefully walking (and stumbling on stage) in her extra-voluminous Dior Haute Couture gown, the Silver Linings Playbook actress changed into a more movement-friendly shimmering gunmetal beaded design, courtesy of Calvin Klein creative director of womenswear Francisco Costa, for the Vanity Fair after-party. And Costa was thrilled to have the newly-appointed Oscar winner in his design at the Oscars yet again—he first dressed her for the 2011 Oscars in the memorable red column. “It’s a magical moment that clicks,” Costa told InStyle.com when we caught up with him after a day of fittings at Mario Testino’s exhibition opening the night before the Academy Awards. “It just sometimes a perfect moment. Like Jennifer before, it was perfect. It’s one of those moments we need.” And he got it!

Tell us by voting in the poll below: Which of her two Calvin Klein looks do you like better?

Plus, see more of Jennifer Lawrence’s best looks ever!

jennifer’S LOOKS

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• Oscars 2013: Behind-the-Scenes Instagrams!