Justin Bieber, Travis Scott Call to Action Let's Get Drunk!!!

9/5/2015 6:57 AM PDT

Justin Bieber, Travis Scott -- Call to Action ... Let's Get Drunk!!! (VIDEO)

EXCLUSIVE

Justin Bieber and Travis Scott became strange bedfellows at Travis' album release party, rapping about the virtues of getting wasted.

Justin joined Travis for his new album, Rodeo, at Up&Down nightclub in NYC.  The reason it's weird ... Justin has really cleaned up his act in the last year ... radically cutting back from excessive drinking and other activities.

Nonetheless, there was Justin and Travis singing "Maria" ... chanting the anthem, "Call your friends.  Let's Get Drunk!"