Whoa there! Kristen Stewart has come a long way from playing Bella in Twilight. The 24-year-old actress bares her butt in a thong in the first offical trailer for her upcoming film, Clouds of Sils Maria.

The drama, which also stars Juliette Binoche and Chloë Grace Moretz, tells the story of a famous actress (Binoche) and her assistant (Stewart) who becomes jealous of a co-star (Moretz) and attempts to romance her boss.

In the first official trailer, released on May 22, Robert Pattinson's ex is seen not only trying to seduce Binoche's character, but dozing off in a racy, black thong.

The film is set to make it's debut at the Cannes Film Festival on Friday, May 23. (Stewart hasn't yet made an appearance at the festival, while ex Pattinson, 28, has been promoting two of his own flicks The Rover and Maps to the Stars with other stars there.)

Watch the trailer above to see K-Stew for yourself!