Style star: Keira Knightley at 'Anna Karenina' premiere

by Cindy Clark, USA TODAY

3291330
Actress Keira Knightley attends the premiere of 'Anna Karenina' at ArcLight Hollywood on Nov. 14. (Credit: Jason LaVeris, FilmMagic)

We admit it: Our jaws hit the floor when we saw actress Keira Knightley step out in this Erdem stunner at Wednesday night's premiere of Anna Karenina in Hollywood.

The ethereal gown is a customized version of the "Sira" dress in embroidered silk from the designer's spring/summer 2013 collection.

Knightley's chic updo was the perfect complement to the goddess-like gown, which sported hidden pockets. Think she's got anything in there?