Kristen Stewart is no stranger to nudity, she famously stripped down to her skivvies for a steamy kissing scene in a Brazilian lake with ex-boyfriend Robert Pattinson in "The Twilight Saga: Breaking Dawn-Part 1" and she recently went topless as the face of Balenciaga for their Bontanica fragrance.

Now the "On the Road" star has decided to strip down to her bra and tighty whities for a scene in her latest film "Sils Maria"

The actress was spotted in the Swiss mountains along with her French co-star Juliette Binoche who actually went nude for the lake scene. Stewart wore a black bra with white briefs which once became soaked by exposed her black thong.

The 23-year-old actress seemed to be seemed to be bothered a bit by the chilly lake water however, her 49-year-old Oscar Award winning cast mate seemed to have a greater tolerance for the temperature than the Californian-born actress who looked shocked as she took entered the body of water, according to the Daily Mail.

Seeing as the film is being shot in October, temperatures are much chillier which explains why there were a slew of assistants on hand with a towel and turban for Stewart's dripping wet hair when she emerged from the water.

Juliette Binoche went nude in more ways than one as the actress filmed the scene without an ounce of makeup.

[For photos of Kristen Stewart and Juliette Binoche click HERE]

"Sils Maria" stars Binoche as seasoned actress Maria Enders who becomes fascinated by a younger star, played by Chloe Grace Moretz. The movie follows Maria's reaction when Moretz's character signs on to play the very same role that made her famous.