LeBron James -- Shirtless Hot Tub Celebration ... With Cavs Squad!

How did LeBron James and the rest of his Cleveland Cavs squad celebrate after winning the Eastern Conference Championship Tuesday night?!

TURN UP IN THE HOT TUB!

James, along with J.R. Smith, Kyrie Irving, Iman Shumpert and Kendrick Perkins grabbed some bubbly and their championship hats and sang along to Chedda Da Connect's "Flicka Da Wrist."

But the most impressive part of the entire victory turn up ... how the hell did so many giant men wedge themselves into a such a tiny little tub??!

Who cares ... TURN UP!