Do a lot of high intensity leg workouts... and who doesn't like girls with big bottoms ... must be shape though..
girls with big bottom every guy like it only if its in nice shape do butt workouts in intense mode ..will help you alot
Alexander and Money S are right try doing intense exercises that also workout your problem area. Cardio is the best fat burner but to tone up your booty try High Intensity Interval Training. The short spurts will spike your metabolism, helping you build muscle and burn fat well after your workout is done. Checkout my exercise (Sexy Booty) I created it from exercises I found here and at ab-workouts-guide.com if you like try Thankful Thighs, Natural Booty Pops, and Go Go Gadget Legs! There short intense but well worth it. Have fun...
Good luck and God Bless!