There are a series of photos on the net of her smoking pot on (what looks like) the steps outside a Burbank sound stage. Some slacker guy is sitting next to her Her dealer, perhaps?), and she's using one of those hippy-esque glass pipes with the little carb on the side of the bowl.
That would explain her perennialy red, heavy-lidded eyes.
She just looks unclean. Even in the movies, her hair looks greasy, and I just think she’s not really attractive.