Usher (Facebook)

R&B stars Usher and Chris Brown were allegedly involved in an argument that turned violent in Las Vegas Saturday night.

Multiple media outlets in the US reported that Usher suffered a bloody nose and bruised ribs.

On Saturday, TMZ uploaded a video that showed Brown arguing with Usher in a new video.

TMZ reported that Brown had approached singer-actress Teyana Taylor and became miffed when she ignored him.

Chris Brown (Facebook)

It was reported that Brown, who was celebrating his 34th birthday Friday night at Skate Rock City in Las Vegas, wanted Taylor thrown out of the party. But Usher intervened in her defense. This allegedly started the argument.

"In the video, you can see Usher trying to de-escalate the situation, to no avail. The outlet reported Brown started cursing out Taylor before directing his anger at Usher. TMZ goes on to report, citing sources, that Brown and his crew left the skating rink, only for Usher to follow in pursuit. The outlet goes on to report that, after going behind a string of charter buses, Usher emerged a short time later with a bloody nose," Entertainment Tonight reported.

Usher and Brown have been longtime friends. They were scheduled to headline Usher's "Lovers and Friends" in Vegas Saturday night.

Reports said that Usher will continue to perform despite the incident.