An interview with Simpsons writer, Don Payne, produced this interesting tidbit.
Q: So, what's new at The Simpsons?
A: They're working on the movie right now. I'm not working on that. But I'm looking forward to actually seeing a new Simpson story which I haven't had anything to do with -- on the big screen, no less! I have an episode coming up which features Natalie Portman as a guest voice. In the episode, Bart accidentally saves the town, and they grant him one wish. He decides he wants a driver's license. He drives to the next town over, where Natalie Portman's character lives. She's a teenager, and she thinks Bart's 16, since he's driving - and they start dating. It actually turns into a very sweet story.