One More LOST-Related Note

I was watching Kimmel's "Aloha To LOST" online this morning (if you haven't seen it, you should and can do it right here).

While I was listening to every word that was being said - that Jimmy has some good ideas about where the show was going - I kept staring at the screen every time Jimmy was on. Look, I don't think he's handsome, so that's not it. I kept seeing this woman in a Hawaiian shirt and lei peeking over his shoulder.

Who was she? Why was she there? And why did she look a lot like Marion Ross?