Obviously, I would go with Hayden. Great actress and very attractive lady. I'd do her anyday.
Ke$ha is just hideous to look at. They even had her on Dick Clark's Rockin New Years Eve for 2011, and I couldn't stand her. Plus, why would she want to wear blue lipgloss anyway? That looks terrible.
Her music is just as bad too. I hate her music even more than I hate Katy Perry. All of her songs that I've heard is a bunch of god-awful over-glamorized piles of crap. That's enough to make my ears bleed.