18. Jennifer Lopez
If you look past her so-so music, her questionable marriage to backup dancer Cris Judd, the Bennifer fiasco and her split with Marc Anthony, what do you see? A big, beautiful, culturally significant ass, of course. (How could you miss it?) Seriously, J. Lo made so much off of that rump that it didn't even seem far-fetched when we heard a rumor that she'd had it insured for $300 million. That's only like $1 per square inch.
DECADE ACHIEVEMENT: Making a play for the Billboard charts again with singles off her latest album Love?, adding sex appeal to American Idol and giving us hope by turning into a cougar.