Chris Brown's Post-Jail Party -- Porn Star Ass-Fest

One thing Chris Brown may be done with is gangs, but gang bangers ... not so much.

Porn stars Alexis Texas, Bonnie Rotten, Alektra Blue and Sarah Jessie posed backside first for a pic at Chris Brown's Beverly Hills bash Thursday night.

Also on deck, porn star Kimberly Kendall -- who tweeted a pic of Chris dancing with her and a bunch of other hot chicks after blowing out the candles.

As we previously reported, T-Pain told us there was no weed smoking allowed at the party.

Porn star booty > smoking weed.