Parade Magazine interviewed Kristen Stewart and she spoke about the filming time frame of "Eclipse" as well as "Twilight" and "Runaways".
Q: Talk about systems overload, in the midst of filming the next two Twilight movies, we hear you're also going to be starring as Joan Jett in The Runaways?
A: Yes. We'll be shutting down for eight weeks in between New Moon and Eclipse and that's when I'll do it. Right now I'm just listening to Joan's music all the time. I spent New Year's with her.
Read the full interview
Found via Confessions of a Twicrack Addict