6. Jessica Alba
First of all do you really care that Jessica Alba can't act? No? At least we're on the same page. One look at this gorgeous creation and you don't need any more convincing that she should be in every movie... ever. And that sadly has lead to her being cast without anyone trying to challenge her into actually trying to really act. Still there comes a point where the hotness doesn't always make up for the lack of acting skills, and that point is somewhere between Into The Blue and Fantastic Four: Rise of The Silver Surfer. Alba is basically talking furniture in both of them, and manages to reduce Invisible Woman to an actual realisation of her superhero name. None of these acting skills I'm speaking of really matter when you look as good as she does though. You could remake the Super Mario Bros. movie shot for shot with her playing King Koopa and I would not only watch but probably enjoy it.