The last time the Fanning sisters were in the same movie (I Am Sam), they played the same character at different ages. Now they've been cast in a new movie in which they both exist for the same character. Confused? Hold on. According to Variety, Elle and Dakota, who are now 9 and 13 respectively, will star in Nick Cassavetes' adaptation of My Sister's Keeper alongside Cameron Diaz. Based on the novel by Jodi Picoult, it's the story of a young girl who was conceived solely for the purpose of being a genetic match for her older sister, who is suffering from cancer. So, basically, Elle's part is that of a literal tool, existing only for the extension of Dakota's character's life. And I guess the parents don't treat the younger enough like a real, intentional child, because she ends up suing them for divorce -- kinda like little Drew Barrymore does in the largely forgotten gem from my youth, Irreconcilable Differences. Cassavetes' partners from The Notebook, screenwriter Jeremy Leven and producer Mark Johnson, are also on board, and production is set to begin in March.

If there's any competition between the Fannings for who will be the first to score an Oscar, this could be the movie in which to really shine. For the older Dakota, we've got a character dying of a disease, which at least used to be an Academy favorite for recognition (maybe if she was also mentally handicapped, she'd have more of a chance). Then for little "Sweetie Pie" (I'll never stop calling Elle that, even when she's 30), there's the strong court-battle role, which typically serves up meaty performances. And with Diaz in the movie, the sisters are sure to appear even better actresses than they are. As we told you in July, Diaz will play the girls' mother, who was cast first and then required the lowering of the sisters' ages from 13 and 16, as they are in the book (what, we can't believe Diaz had a daughter when she was 19?). Although this will be the first movie Elle and Dakota appear in together as sisters, they did play sisters in the American dub of My Neighbor Totoro -- which only used their voices (you should really watch the subtitled version; it's so much cuter). So, will the Fannings compete too much and end up giving us over the top delivery? Or could they both be good enough to further compete come awards time? Or will we be so over them by the time this movie comes out and not care either way?