Kristen Stewart rides to the Sunset Sound Studios in L.A. today with the REAL Joan Jett, who is an executive producer for the biopic of her band The Runaways. Dakota Fanning also joined them, but we have yet to see their co-stars Stella Maeve and Alessandra Torresani. I think those two are really missing out. I mean how cool would it to jam with a real rocker!!