UFC star Ronda Rousey made a surprise appearance at WrestleMania 31 on Sunday night (March 29)… to back up superstar The Rock.

Stephanie McMahon confronted The Rock in the ring, and slapped him, and when asked what he would do… he went to the front row and enlisted Rousey to help him out.

The UFC superstar stepped into the ring, judo threw Triple H and manhandled McMahon… before The Rock offered his signature commentary.

“And that is the biggest WrestleMania moment of the night,” he said. “It’s The Rock and Ronda Rousey laying the smackdown on your candy asses… if ya smell what The Rock and Ronda is cooking.”