usher2pic460.jpgCourtesy: WireImage

Usher hit up the Bank Nightclub at Bellagio to host his offical O.M.G. tour after-party.

Insiders tell us the R&B recording artist was given a tray of flaming hot tottie shots as the DJ played his hit song, Hot Tottie. We're told the drinks were flowing until the early morning hours with Usher giving shout-outs all night long.

Sorry, Usher ... what happened in Vegas, didn't stay in Vegas. But it sounds like the party was off the hook!