I don't think she would; I certainly wouldn't, cos I'm such a personality girl. And there's the other thing with it being a celebrity, it's idolisation primarily. Finding out he's a bit of a twunt is just a realisation: it's not like he was always nice and then became an idiot, she never knew him and has only just found it out.
Then again, there is always the bad boy/inaccessible thing: some strange women think that the worse a man treats her, the more desirable he is. *eyeroll*