It was like a scene from "Rocky III" ... LeBron James walked into a Vegas club Monday night complete with his own marching band and fireworks -- and the crowd went insane!
It all went down at Marquee at the Cosmopolitan hotel -- where the club hosted a Cavs championship celebration for King James.
LeBron -- following his own party advice -- got on the dance floor and jammed out to Drake's "Forever."
Not a bad way to spend a Monday night ...
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