UFC fighter and the star of his own MTV show, Bully Beatdown, Jason “Mayhem” Miller was arrested after breaking into a church and trashing the holy place…

Cops responded to Mission Hills Church in Mission Viejo about a possible 211 in progress.

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When cops arrived,

TMZ is reporting, they found the first and second floors covered in white fire extinguisher spray. Cops say the place was also trashed — scattered CDs, books, and broken pictures.

When officers reached the second floor, we’re told they found Miller naked on some couch — totally awake and coherent.

Miller — who also hosted the MTV reality show “Bully Beatdown” — was taken into custody for burglary, and is currently being medically evaluated. It’s unclear if Miller was under the influence.

It’s worth noting — UFC honcho Dana White cut Miller earlier this year, claiming “some crazy sh*t happened backstage” at UFC 146 and Miller was fired.

Miller and White went back at it on Twitter recently, with Miller telling White to “kill yourself.” Calls to Miller’s rep were not returned.