The Twilight starlet spent the summer playing Jett for a movie about the ’70s all-girl rock group The Runaways. The film, loosely based on Runaways singer Cherie Currie’s 1989 memoir, Neon Angel, is expected to hit the silver screen sometime next year.

For the first time, Joan Jett reveals what she thought of 19-year-old Kristen’s performance.

“Kristen was so into it, into the whole vibe of doing this,” Jett remarks in the new issue of Billboard Magazine. “I think she felt a weight and a responsibility to interpret it correctly. She was really serious about it and was watching me and asking me all sorts of questions, from speech aspects to watching my body language, watching where I stood, watching my guitar playing. She really worked hard to get it right.”

Kristen Stewart, who plays a young Joan Jett in the upcoming biopic The Runaways, got a case of the snuffles after the iconic rocker gave her a hard time on set last week.

Kristen, best known for her role as Bella in the Twilight films, burst into tears after Joan harshly critiqued her performance in front of the rest of the cast.

“Joan just wants Kristen to play an authentic version of herself, so she needled her a little bit too much. But she apologized when she realized how upset Kristen got,” a spywitness told The NY Daily News Tuesday.

Twilight actress Kristen Stewart will play rocker Joan Jett in The Runaways, a upcoming biopic about the popular all-girl hard rock band of the same name.

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