DERRICK LEWIS stunned UFC fans around the world by MOONING the crowd after getting back to winning ways.

The fan favourite extended his record for the most knockouts in UFC history with a brutal third-round stoppage of Rodrigo Nascimento in the main event of UFC St. Louis early on Sunday morning.

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Lewis celebrated his 15th knockout in MMA’s top promotion by taking off his shorts, which he first did on the undercard of Conor McGregor’s grudge match with Khabib Nurmagomedov in 2018.

But he went a step further by cheekily exposing his backside to fans in attendance at the Enterprise Center.

Lewis mooned fans by pulling down the back of his sweat-covered grey compression shorts before promptly pulling them up.

Fans in the arena lapped up the cheeky act, as did those watching back at home.

One wrote on X: “Best post-fight interview ever.”

Another said: “That’s crazy.”

And another said: “Celebration GOAT.”

One remarked: “I love how the officials behind him took a step back.”

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Another chimed in: “Total solar eclipse.”

One asked with a laughing emoji: “How cool is he?”

Lewis’ flashing of his rear end was preceded by him throwing his groin guard to the media section.

The reporter who caught the cup brought it to the post-fight press conference, where he asked UFC president and CEO Dana White to sign it.

White, 54, saw the funny side of the request and duly obliged.

Victory over Nasciemnto saw Lewis bounce back from his decision defeat to Jailton Almeida last November.

But the fan favourite won’t be rushing back to the octagon anytime soon, telling Michael Bisping: “I’m going to sit my Black a** down for a second.

“I’m getting too old for this s**t. I’m in my prime, but you didn’t see that s**t.

“You don’t see too many almost 40-year-olds doing that s**t like that.”