Last week, Natalie Portman stopped for lunch at Urth Cafe in West Hollywood in just about the nerdiest frock we've ever seen. Though, she made it up for it last night at the Venice Film Festival’s Style Star Lounge.

Portman looked ravishing in a deep purple Miu Miu dress and Charles David shoes while promoting her new flick, "Black Swan," the opener for the festival. The thriller, directed by Darren Aronofsky (The Wrestler), is set in the world of ballet rivalry (starring Portman, Mila Kunis, and Winona Ryder). "Black Swan" hits theaters December 1st, 2010, check out the trailer here: