Dakota Fanning, another former child star, bonded with Stewart when they made two films back to back: The Twilight Saga: New Moon and The Runaways (about the 70s girl-band fronted by Joan Jett).
"We became really close," Fanning tells Teen Vogue in its December issue. "It's like we'd known each other our whole lives. We talk all the time."
Playing evil vampire Jane in New Moon, Fanning, 15, found it difficult victimizing her new friend. "Being mean to her was really weird. It's like, Sorry dude!"
As sisterly punk rockers Joan Jett (Stewart) and Cherie Currie (Fanning) in The Runaways, she says "The relationship that Joan and Cherie have in the script is kind of the one that Kristen and I have in real life . . . minus the destructive part."
Speaking of destructive, Fanning assures Teen Vogue that she'll steer clear of the dangerous path taken by other adolescent stars. "I get my rebellion out through movies," she explains. "I'm boring that way. I enjoy having a normal life."
How normal? She's a varsity cheerleader (and recently named homecoming princess) at her private L.A. school, and loves eating sushi and watching The Rachel Zoe Project with her friends. She's only dated "one boy from school. I have a small class, so the pool is very limited."