NAKED GIRLS EVEYWHERE AT JUSTIN BIEBERS PARTY!

Justin Bieber's Gatsby party on Friday was FILLED with naked chicks ... as far as the eye could see ... this according to sources inside the party -- and all Justin's celebrity friends were there, including Floyd Mayweather and Chris Brown. Sources also say Floyd, T.I, Trey Songz and Snoop was there to.
20 big booty strippers and more than $10,000 in cash rained over the girls that night. 

TMZ broke the story ... Bieber's party was a rager and Bieber's neighbors weren't happy -- 
one even filed a police report, claiming Bieber was disturbing the peace.