In a shocking—shocking!™—development destabilizing the world of preternaturally talented child actresses whom Hollywood will suck dry before their 18th birthdays and banish to SAG's Not-So-Cute Anymore Halfway House in Reseda, both Dakota and Elle Fanning have abruptly exited the film My Sister's Keeper, the project that would have represented the sisters' first cinematic collaboration since sharing a character in I Am Sam.