kstewbutt.jpg We already knew Kristen Stewart was playing a stripper in her latest flick Welcome to the Rileys, but we had no idea we'd be getting a peek at her bare bottom!

On the red carpet at the Sundance Film Festival over the weekend, Kristen admitted that she was freaked out the first time she slipped into fishnets and worked the stripper pole, but she "really tried to own it." Kristen wanted to practice her pole dancing in her street clothes, but her stripping coach insisted that she do it in her character's skanky attire. Kristen added, "My character's not sultry, not sexy. She sort of throws herself into all her moves. I tore myself up doing it."

In her first scene in the film, the Twilight starlet works the stripper pole in fishnets, platforms, a bra and a mini-skirt, and a little bit later we get a peek at her bare bottom. And it sounds like K. Stew really embraced her role too! "I was able to walk around the streets," she said. "I was literally walking down the street in cut-off shorts and a robe that was cinched. I looked like a crackhead!" Uhh, where were the pictures of this!?