Chris Brown 's Breezy Bowl XX concert at the New Orleans Superdome turned into a royal rumble last night ... after a group of women ganged up on another lady and beat the brakes off her in the stands!!!

TMZ Hip Hop obtained video of the wild encounter unfolding in the seats ... with 2 women -- one in blue, one in black -- arguing as another woman steps in to prevent the one in black from lunging forward. TMZ.com

Shortly after, another woman rushes into their section, briefly consults with the woman in black being restrained ... and then immediately launches into an attack on the woman in blue, clocking her cold in the face!!! TMZ.com

With the woman in blue's attention turned to the one who socked her, another lady in the row behind grabs the woman in blue's arm ... which opene

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