Ray J went down in flames during his celebrity MMA match Saturday night, getting his ass whooped by Supa Hot Fire.

The artist went toe-to-toe with the popular YouTuber for just two rounds during their co-main MMA fight at Adin Ross' UFC Apex event in Las Vegas. 

In the second round, Ray had Supa against the ropes, throwing a few body punches ... which was directly followed by Supa hitting Ray with a hard right hook square in the face, and Ray fell into the ropes before hitting the canvas.

Ray eventually got back to his feet, but he was so dazed he had to sit down on a stool. And that was that, folks. The ref stopped the fight.

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But things got even crazier during an after-fight interview, in which Ray suggested he had a plan in place with Supa and they lost money as a result of the knockout. 

In the other co-main fight, former Heisman Trophy winner Johnny Manziel, made quick work of social media influencer Bob Menery, beating him in the first round.