I would guess INFP. But who knows. Some actors and actresses are hard to type because, well, they're acting. I usually have radar for ENFP and ESFP women because I'm an INTJ and am very drawn to them, but Angie Harmon and Angie Dickinson didn't strike me as EFPs until I saw them in interviews because their characters are so serious. Same with the brown eyed girl on JAG.
As for Scarlett she seems to be a P in some movies, like The Island. And mousy, so I would say an introvert. She's not exactly my type, but damn. She IS cute.