Leon Edwards is the NEW UFC welterweight champion.

'Rocky' lived up to his nickname by knocking out Kamaru Usman in the main event of UFC 278 in Salt Lake City in the early hours of Sunday morning.

Edwards, 30, exacted revenge on Usman, 35, to claim the UFC welterweight title and finally achieve his childhood dream of becoming a world champion.

He became the first British MMA fighter since Michael Bisping himself to win a UFC championship as a result.

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Edwards had some success in the first round but it was pretty much one way traffic after that.

That is until he landed a head kick from nowhere that left the former champion lying flat on his back staring straight up at the ceiling with just over a minute left on the clock.

You really couldn't write it. What a comeback for Edwards. Talk about a one-hitter quitter!

WATCH: Leon Edwards dethrones Kamaru Usman with insane head kick KO

Check out the video below...

Even the commentators could hardly believe what they had just witnessed.

As for Usman, he could only shake his head in disbelief after he suffered the first defeat of his UFC career.

He had never been stopped like that before but Edwards showed why he is welterweight champion with a hugely impressive win over the man who many - including UFC president Dana White - considered as the pound-for-pound king prior to UFC 278.

And of course he couldn't resist the chance to recreate the iconic billy strut made famous by Conor McGregor in celebration.

Edwards entered the rematch as a massive underdog and after his victory, he said: “You all said I couldn’t do it. Look at me now! Head shot, dead. That’s it. 

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“It doesn’t matter from the trenches. I’m built like this. I go until the bell’s done.

"Look at me now. I told you I could do it. Pound-for-pound, what? The belt belongs to nobody!

“I can’t explain it. God is on my side. I felt like this was my moment.

"They all said I couldn’t come back and do it. Now look at me now. Champion of the world.”