Rapper Trinidad James Arrested -- 'All Gold' Rapper Goes Green ... Gets Busted for Marijuana Possession

Trinidad James just got busted for possession of marijuana after lighting up in his Mississippi hotel room ... TMZ has learned.

Cops in Panola County tell us the rapper -- real name Nicholas Williams -- is in custody and being booked right now.

We're told Trini -- whose biggest hit is "All Gold Everything" -- was arrested at the Batesville, MS Holiday Inn.

Just 2 nights ago he was hanging with Diddy, Jermaine Dupri, T.I., and Justin Bieber ... in an Atlanta nightclub.

Looks like Bieber's recent luck rubbed off on Trinidad.