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Former pop star and current douchebag sidekick Justin Bieber was amped up before the Floyd Mayweather-Manny Pacquiao fight Saturday in Vegas.

The alleged vocalist left no doubt whose team he was repping at Rehab (the hot spot, not an actual treatment center), dropping an f-bomb to boot:

Prior to the Fight of the Century, in which Mayweather prevailed over Pacquiao in 12 epic rounds, Bieber was chilling with the Money Man in Sin City.

As the two were rolling out of the aforementioned hangout, Bieber was seen saying "F–k Pacquiao" and flipping the bird to a fan. Classy as ever.

The other funny part of this video? The 21-year-old shirtless stooge is getting his groove on to "I Don’t F–k With You" by Big Sean, of all people.

Sean recently split with girlfriend Ariana Grande after Bieber groped Ariana in concert, a move Sean feels his now-ex orchestrated to hurt him.

According to insiders, Big Sean has no lingering bitterness toward Justin – and did not write that threatening tweet after the groping took place.

That tweet was fake, his camp says, and Sean thinks the Biebs was just a pawn in Ariana’s sick mind games. So no hard feelings from Sean.

Manny Pacquiao, on the other hand? We would drop $99.99 on pay per view in a nanosecond to watch the Filipino fighter get in the ring with Bieber.

Dude definitely needs to get slapped around a little, but in all likelihood Shanina Shaik did the honors, naked, after the fight, so … joke’s on us?