Ludacris Hard Rock Pool Party Brawl In Las Vegas

The REAL fight in Vegas went down the day after Mayweather-Pacquiao -- a huge melee at the Rehab pool party hosted by Ludacris.

The video is absolute INSANITY -- showing multiple brawls around the pool on Sunday at the Hard Rock Hotel -- fists, chairs, bottles, ice buckets and more were hurled. Even before the fight broke out ... you can see the crowd rip a door off its hinges to burst into the party!

Jamie Foxx and Will Smith's son Trey were also at the party at some point -- though it appears they weren't involved or injured in the fight. Perks of VIP.

Here's the story from the video:

A dayclub in Las Vegas called Rehab located at Hard Rock Hotel pool was subject to confusion this weekend, May 2015. People were hopping the fence to get in. Then fights erupted ….

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