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12/22/2012 at 12:00 PM ET

jessica chastain 300x400 This Week’s Best Dressed Star: Jessica Chastain
Marion Curtis/Startraks

With a hot new movie and an acclaimed Broadway show, Jessica Chastain has a lot to celebrate this season. And now she has another accolade: she’s this week’s best dressed star!

More than 16,000 of you gave Chastain’s simple, elegant ensemble — a peplum dress and Casadei sandals, worn to a Zero Dark Thirty screening in N.Y.C. — some love, propelling her into the top spot on our best dressed list. Chastain finished her look with natural makeup, minimal jewels and a flawless blowout.

PHOTOS: SEE THE TOP 10 BEST DRESSED STARS ON PEOPLE.COM THIS WEEK!

Coming in second was another fashion favorite, the Duchess of Cambridge, who wore a forest-green Alexander McQueen dress (with a sexy thigh-high split!) for the BBC Sports Personality of the Year Awards in London — her first public outing since her recent hospitalization.

Click here to find out who else ranked in the top 10 and vote for your favorite celeb looks. Tell us: Are you a fan of Chastain’s winning look? Who do you think deserved the title of best dressed star this week?

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