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Last night Kristen Stewart hit the red carpet tonight for the premiere of her film The Runaways. Wearing a short red dress and showing off those legs, Kristen was little daring with some very revealing fabric in the bust area. She’s sexing it up.

In the film Kristen Stewart shares a passionate kiss with Dakota Fanning, but Dakota’s age affected the scope of the scene. “She was 15, and I wasn’t allowed to grope her,” Kristen, 19, told Access Hollywood. “I’m actually not kidding, there are major restrictions that I don’t remember [from] when I was younger.”

“I don’t want to give anything way. It’s a really passionate, hardcore scene,” she joked. “No, it’s just a kiss. It’s not really a big deal.”

Kristen looked like she was having fun at the after party with Joan Jett and the rest of the cast and band, plus Taylor Launter.