By TMZ Sports

Two undefeated fighters hang together under the sun. UFC champion Chris Weidman mixed fun with mixed martial arts this weekend, mugging with WBA/WBC welterweight champion Floyd Mayweather Jr. at a Vegas pool. Weidman was celebrating Saturday's title victory.

Chris didn't look the worse for wear after his first round knockout of Victor Belfort at UFC 187. The sunglasses are pretty big and could be hiding a bruise or two, but Weidman took care of business pretty quickly so probably not.

The two champs were hanging out at the pool at The Palms, where Weidman was hosting a post-fight event.

Mayweather is not scheduled to return to action again until September 12th.