Beyonce's ass is overrated. It's not overly big at all. she just has wide hips and thick thighs which makes that ilusion (that bikini pic posted proves that fact). It's not flat but it's not as big people claim either.
Everyone knows Jennifer Lopez has the most celebrated derriere in Hollywood and Music history, and she is still claiming #1's in Best Bottom lists (check 2010).
How the hell is she behind in this competition? Shakira ahead of J.Lo ike really? Lady Gaga and Rihanna on this list? LMFAO! Wow.
Sounds like a competition of Who's Your Fave Artist then Who Has The Best Ass to me. Fail!