Beyoncé Fans Fight After Cowboy Carter Concert, on Video

Beyoncé's first Cowboy Carter concert turned into a WWE event after her performance ended ... because a bunch of her fans started brawling in the VIP lounge.

Ya gotta see the video ... as Beyoncé fans are making their way to the exits at SoFi Stadium, a group of women get into a huge fight ... and bodies start flying and hitting the deck.

It seems this all started with an argument, and things get really heated when one woman knocks a cowboy hat off another woman's head ... leading to a bunch of pushing, shoving, falling and cowboy-boot kicking.

Beyoncé performed the first of 5 shows at SoFi in Inglewood, Calif. ... and her fighting fans were decked out in cowboy attire.

The performance was about 3 hours long ... so at least these folks waited until the end to start fighting.