Actress Kristen Stewart is to hit the gym after vowing to get into "the best shape of my life" for her next role in a gritty action movie.
The pale-skinned Twilight beauty will get a tan and dye her hair blonde before shooting edgy thriller Cali with director Nick Cassavetes.
She tells Women's Wear Daily, "I'm going to get into the best shape of my life. I'm going to look like a stripper. I'm going to look like a porn star."
Stewart will play Mya, who flees Los Angeles with her boyfriend after selling a snuff film, but returns years later to save her sister when she lands in trouble.
The 22 year old admits she was intrigued by the "extreme in every way" script and hopes she can get to grips with her character's psyche.
She adds, "A lot of times, you'll read a script and you can identify with things that are very surprising, things that kind of shock you about yourself. And the process of making the movie is finding out why those feelings occurred. Sometimes they're not always easy to define..."
"(But) if you don't know why someone is the way that they are, then you're just playing a caricature of a girl."