After they allegedly called the singer Usher, Jason Derulo was videotaped arguing with two men in Las Vegas.

According to TMZ, police officers were called to Derulo's hotel on Tuesday morning (January 4) after allegedly assaulting two men at the hotel's bar.

According to eyewitnesses, Derulo and one of the men allegedly passed one another on an escalator when he called out, "Hey, Usher!" "Fuck you, scumbag!" Derulo is accused of punching the victim in the face, knocking him to the floor.

Derulo allegedly slapped the second man, prompting hotel security to intervene and break up the brawl.

The two claimed victims did not immediately seek charges, but they have one year to do so if they change their minds.

Derulo was revealed as part of the lineup for this year's Rock in Rio Lisboa festival in June, which will take place in Lisbon, Portugal, between June 18-19 and 25-26.

On the bill, he'll be joined by Post Malone, Foo Fighters, The National, Liam Gallagher, Duran Duran, a-ha, and Bush, among others.