Dwight Howard: Massive Celeb Mansion Party ... for 30th Bday (Pics & Video)

Dwight Howard BALLED OUT Sunday night ... partying HARD at a massive Houston mansion to celebrate his 30th bday ... with huge stars like T.I., Bun B, Lil Boosie, Jay and Jas Prince and more.

It all went out at the Chateau Cocomar -- a MASSIVE mansion-style venue in H-town -- where a bunch of D12's closest friends and teammates (including James Harden and ex-NFL star Vince Young) turned all the way up into the early hours.

Some of the highlights: The whole thing was Great Gatsby themed ... James Harden danced his face off with Dwight ... and Lil Boosie and T.I. performed and killed it.

Plus, the dance floor had a big Superman logo on it.

In the end, Howard had a pretty good weekend ... plus, the Rockets won again on Saturday night.