Charlie Sheen joined Brooke Burke, Billy Bush, Sugar Ray Leonard, Vito Schnabel, Evan Ross and Ashlee Simpson at Operation Smile’s Hollywood fight night.

“Charlie hopped into the ring with a pal and served as his corner man to hype him up,” a source said. “Mario Lopez acted as a coach for his manager Mark Schulman.”

We’re told Burke packed on the PDA with boyfriend Scott Rigsby. Avril Lavigne presented a donation on behalf of InMode.