Gwyneth Paltrow, Kristen Stewart and Sarah Jessica Parker joined the designer at the Musee des Arts Decoratifs, along with supermodel of the moment Karlie Kloss and Gleek Dianna Agron.
So which star was best dressed? Paltrow did laid-back chic in her blazer and cropped trousers, while Stewart did her rock-chick thing in a super short leopard print mini and smoky eye makeup. As for SJP, we love a floaty maxi dress but isn't it a bit early for the summery style?
Let us know how you rate their looks and take a look below to see which other slebs were spotted (plus Marc Jacobs wearing a pink dress) at the party.