Usher‘s serving up some hot cakes during his tour with fellow R&B star Chris Brown … exposing his bare butt to fans during a sensual number … and it’s on video.

The pop star is currently touring the country with Breezy … and during a recent performance in Maryland, he stood up from a bed on stage and exposed his buck naked bottom.

Usher flashed some serious booty while performing “Seduction” … he was simulating sex with a woman and he got out of bed while buttoning his pants.

After flashing his cheeks to the audience, Usher grabs a bar and starts doing some pullups.

Of course, Usher isn’t the only performer getting naughty during these shows … Chris has been grinding on some ladies from the audience. In fact, during this same tour stop he thrusted into a woman with her legs held high into the air.

And during his live show in Minneapolis, Breezy went to town on another woman while she was on all fours on a mattress on stage for a rendition of “Take You Down.”