Unfortunately for Nicki Minaj proof appears to have been found when she performed at a recent concert. While sitting on stage and leaning backward the odd shape that her backside took was captured by numerous professional photographers. The picture made it look more like she was sitting on a large cushion instead of her actual butt. When you combine this with her tiny frame and legs, it becomes pretty obvious that Nicki Minaj has had butt implants put in.
While she may not want to admit it, the facts is that for a woman of her age and build having a butt as large as hers in next to impossible. Your butt is composed of both muscle and fat. If she were to develop her butt in a natural way then she would almost certainly have larger and more muscular legs than she does now. Or she would have a heavier over all body type if her butt was largely fat. She has neither, and when you consider this with the photographic evidence it becomes clear that the Nicki Minaj butt augmentation rumors are true. In addition to having butt implants it's also pretty obvious that she has breast implants as well, and in all likelihood has had other cosmetic work done that has yet to be discovered.