Kristen Stewart, the Twilight star says, "If it's not going to be Joan, it's going to be me."Kristen Stewart 'll be belting out her own rock tunes when Stewart plays Joan Jett in upcoming biopic Runaways.
Kristen Stewart showed off her singing skills while performing karaoke with Twilight co-star Robert Pattinson in Japan last month. She insists fans 'll be able to hear Kristen Stewart voice on the soundtrack for the new film, which chronicles the success of Jett's all-girl band.
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