Kristen Stewart and Dakota Fanning premiered 'The Runaways,' the biopic of Joan Jett's 70s band of the same name, on Sunday at the Sundance Film Festival.
Kristen stars as Jett and Dakota as singer Cherie Currie. People reports that when Jett performed in Park City on Saturday night, she asked the girls to join her onstage.
'The Runaways' opens March 19.
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