"Twilight" beauty Kristen Stewart keeps a low profile as she leaves a gym in Los Angeles with her shirt sleeves rolled up and wearing Chuck Taylor Converse sneakers. The 21 year old actress, currently dating her "Twilight" costar Robert Pattinson, is allegedly working on a film script titled "K-11," about an autistic transgender named Butterfly. The film is said to be directed by Kristen's mom, Jules Mann-Stewart, and is scheduled to begin shooting next month.