I've heard Jennifer Love Hewitt a lot, and the that plays Lucy on 7th Heaven.
I've also heard Christina Aguilera (when I was blonde), and the girl who plays Willow on Buffy.
I think there have been other random ones (Jennifer Aniston...?) that I don't see AT all.
EDIT: I'll give you a gold star if you post comparison pictures (
Here's the MOST recent normal picture of me. Do you think I look like anyone? (I think the ones I named previously no longer apply) The picture below it is fairly recent, but it's a clear picture of my face as well.