Surprised this hasn't been brought up yet..

Her lack of a soul. This isn't a hate thread, and I have to admit that redheads can be quite damn hot, and I'm willing to go beyond just 'daywalkers' but this one is so damn 'ginger'-ly she probably de-souls everyone within a 100-feet radius around her. A definite contender for the 'Most Ginger People In Showbiz' list (of course, no one beats Carrot Top, but as far as females go, she comes fairly close).

I'm only familiar with her through Castle (I happen to be a casual fan of the show) and she obviously can't act to save her life and comes off as a trying-too-hard brat, but she has the trailer-trash-pretty thing going for her which is nice (but then again, there's not a single person on that show who doesn't look like a model). I also don't think Castle's ex (her onscreen mom) has been shown on TV - she'd have to be a china-white dementor to give birth to something like this with a fine specimen of male like Richard Castle (tan skin, jet black hair, brown eyes).