It's going to sound totally lame but: I'd date whoever I got along with.
Otherwise I'd really just be dating someone for no other reason than that they're a celebrity and I think they're nice looking in some movie or other. It's not really about them as a person. We might have nothing in common! ... or I could meet some famous person who I wasn't initially attracted to, who turned out to be an amazingly nice guy. Honestly, I'd rather date someone because I met them and found them interesting and we got on well. Plus... naturally... they'd need to be attracted to ME.
Without meeting them, I couldn't tell ya!
Yes, I'm sorry, that was a very lame answer.