Question

If Rodney's sister was a model, who would you cast to play her? Known or unknown person, from today or several years ago, I'm pretty flexible at the moment.

I just remembered that I have this thing to do and I'm drowning in pictures of pretty women. Help!

ETA: Oooh, wouldn't Janeane Garofalo be awesome in the role? Not what I'm looking for right now, but still, it'd be cool.