Guess Who This Fan-Favorite Actress Is!

It looks like it's gonna be a freaky weekend ... and it'll be even freakier if you can't guess who this celeb is!

We caught this actress -- who made her bones in flicks like "Halloween" and "True Lies," in case you need a hint -- while she signed posters for her adoring fans ahead of the wide release of a much-awaited sequel she stars in!

On second thought, maybe it'd be easier to guess who this celeb is if she was standing next to a costar ... maybe someone like Lindsay Lohan would work?