Miracle Laurie.
She's not big by sane standards, but she's a big by Hollywood standards for sure. She seemed bigger in the last episode to me.
This video doesn't show the weight gain but look at the contrast between her and the show's star Eliza Dushku in one scene. All of the episodes are available for online viewing at Fox.com, they're on Hulu also but I think the quality is better on Fox.com. I highly recommend this show, sucks that it looks like it might be cancelled.
http://www.youtube.com/watch?v=tDZa210wqc8