Every so often a movie-maker gets a kick out of taking a beautiful actress and turning them into an ‘ordinary girl’ or a plain or unattractive character (as opposed to a downright ugly woman) who – importantly – does not blossom into a beauty. Or maybe they’re targeting some extra publicity for the movie, or perphaps the actress wants to prove she can be more than a pretty face on screen.
There will also be more examples of this in the look-alikes section where few of the real life personages portrayed looked as good as the actresses portraying them.