Yes, Mary Elizabeth Mastrantonio! But I've never seen hers look as good or nearly as long before or since - alas, I think that was partly extensions.
If we're counting extensions, I loved Meg Ryan's in Sleepless in Seattle, especially early in the movie. I don't know how much of that was really her hair. She really seems to have natural curl, but that was much longer than I've seen hers except maybe in her old soap opera days.