Thanks to sharkington for this info. I'm not sure how credible this source is so we'll pop it in the rumours section.
Geno's World has learned that Lacey Chabert is in discussions to guest star on an episode of "Lost". The "Mean Girls" star would be reuniting with her former "Party of Five" co-star Matthew Fox. It's only a one-shot, but it would be cute to see the two together!
Source: Geno's World