Chris Brown better watch his back.

The popular singer turned Ike Turner wannabe allegedly repeatedly punched and kicked fellow singing superstar and girlfriend Rihanna so violently that she ended up in a local hospital.

This didn't sit well with former UFC star Din Thomas, who had some words for Brown after his first round TKO over Gabe Lemley at March Badness.

"It's not cool to put your hands on a woman," Thomas addressed to the crowd after his victory. "So Rihanna, if you want someone to kick his ass, holler at me."

Get an email update when major stories break! Our email updates are sent out only when a major story (that would appear in the Top Stories section of the site) breaks or after a PPV. Your email is kept confidential and is never given out to anyone. To sign up for our email updates, click here .