Kristen Stewart strips to undies for skinny dipping scene in new flick

Washington: Kristen Stewart has stripped down to her underwear to film a skinny dipping scene for her upcoming film ` Sils Maria.`

The 23-year-old actress was snapped wearing a black bra and white underwear, as she was filming the scene with co-star Juliette Binoche, Us magazine reported.

The `Twilight` actress was sporting a tattoo below her right elbow for the role, as Binoche appeared to go completely nude.

The film, which is directed by Olivier Assayas, features Stewart in a supporting role as Binoche`s assistant.