Kristen Stewart is all set to hit the gym after vowing to get into “the best shape of my life” for her role in a gritty action movie.

The Twilight beauty has indicated that she would pull out all the stops to fit into her role, even claiming: “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.”

Body aside, Stewart — who last month became the highest paid actress in Hollywood — will get a tan and dye her hair blonde before shooting the edgy thriller Cali directed by Nick Cassavetes.

“I was intrigued by the extreme-in-every-way script and I hope I can get to grips with the character’s psyche,” said the 22-year-old brunette who plays Mya, a young girl who flees Los Angeles after selling a snuff film but is forced to come back to save her sister when she lands in trouble.

Stewart’s role in the indie film is being described as “edgy and sexy”, a departure from the whimpering and simpering Bella Swan act that she has perfected in the Twilight films.