What goes on in Vegas most certainly will NOT stay in Vegas here!
Watch it go down (below)!!!
Well, you're in luck because the birthday boy posted all of the pictures on Instagram for everyone to see!
The R&B singer's bestie Scooter Braun threw the surprise party of the year!
An insider said of the impromptu battle:
"All the guys were dancing and there was sort of a dance-off between Usher, his one-time protege Bieber, Diddy and the others. The crowd was going nuts."
We can't imagine how the whole club looked like the night of the party, but it sure sounds wild!
Looks like the night ended on a high note, the Boyfriend singer tweeted:
@Usher that was a great time. love u man. happy birthday
— Justin Bieber (@justinbieber) October 15, 2013
You know what they say, you only turn 35 once!
Ch-ch-check out the crazy party (below)!!
[Image via Instagram.]