Stunna Girl Fight Breaks Out at Concert ... Fan Smacked Her Butt!!!
A new video shows a fight breaking out at a concert ... with a couple people coming offstage to beat on a man they think grabbed a performer's backside.
Rapper Stunna Girl -- who's got a solid online following -- performed in Syracuse, New York Friday ... when video shows a fan reaches up and smacks her on the ass.
While the rapper seems to brush it off in the moment, she walks over to a man -- who many fans have identified as her husband RichMula500 -- and whispers something to him ... and, that's when all hell breaks loose.