A.M.
Paige jeans!!! They are the best for girls with butts. :)
http://shop.nordstrom.com/S/2890506/0~###-###-####~###-##...
Or if you're looking for something a lil cheaper, go with a Brazilian jean. They are cut for curvy women.
http://www.hotfrombrazil.com/index.asp?PageAction=VIEWPRO...