Rumors: Nicki may have had a butt injury to where the implants popped

Rap superstar Nicki Minaj suffered what we're hearing is a "butt injury" during her performance on Tuesday Night's FASHION ROCKS concert.

It's not clear exactlt WHAT happened - but according to our snitch her butt may have "ruptured." The snitch explained, "She hurt her butt when she stretched out. They were like they heard a pop. Since Nicki's butt is fake, everyone thought her butt may have burst."

The medical staff was very HUSH-HUSH about the exact nature of Nicki's injuries. The injury didn't appear to be TOO SERIOUS, as Nicki was able to walk out of the Brooklyn Arena on her own power But we're told that she DID VISIT a doctor for an evaluation.''