Joan Jett is delighted with Kristen Stewart's portrayal of her in new movie biopic The Runaways - insisting the Twilight star's "quiet intensity" defined her.

The teenager studied Jett by listening to the icon's music and partying with the star, and even mastered playing a left-handed guitar in a bid to portray the rocker authentically.

And Jett is convinced Stewart's dedication paid off.

She says, "I thought she had a quiet intensity, the physical stuff... just the way we move in space. We shake our legs, our hands are all over. She just studied me, man."

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(This news article provided by World Entertainment News Network)