Joan Jett schools Kristen Stewart

From Hollywood Crush:

If you've been keeping up with "Runaways" gossip,
you know Joan Jett was a constant fixture on the set—it is her biopic after all!
But watching Kristen and her fellow "New Moon" costar Dakota Fanning
channel her and her '70s girl group was an unusual experience for the music
legend. "It's really hard to put exact words on it beyond saying it’s surreal,”
Joan explained.
To help Kristen with her portrayal, Joan gave her tapes of
herself talking and singing at the age of 14, which Kristen spent weeks
listening to.
“I’m sure it was a strange pressure [on Kristen],” Joan said of
her constant presence on set. “She was kind of intimidated by it, but by the
same token she wanted me there.”

Source: Hollywood Crush