Ray J Gets Wild With Birthday Party on ‘TMZ After Dark Tour’

Ray J‘s expanding his hosting duties on the “TMZ After Dark Tour” … because now he’s helping host birthday parties.

Saturday’s tour featured a b-day charter … and the footage is absolutely wild … with a bunch of ladies dressed up like “The Wizard of Oz” … including one super fun Oompa Loompa!!!

Ray J grabbed someone’s phone and started recording as the whole bus sang and danced to the Kelly Clarkson classic jam, “Since U Been Gone.”

Check out the photos …. the party is hopping on the bus, and folks on the street are looking up at the riders and dancing too!!!