Well, to be perfectly honest, I think the most attractive person in the world is my girlfriend, RedHotDobe.
I don't really know where to go from there, second would have to be Jennifer Garner, she's quite pretty, as is Kiera Knightly. Kirsten Dunst is pretty. I guess rounding out the top 5 would be Ursula Andress, the very first Bond girl, in Dr. No.