Chaos erupted at a Nelly Furtado concert in Moscow after Russian rapper Timati tried to get onstage for a duet with the singer.

The hip-hop star was stopped by security as he attempted to mount the stage for a scheduled performance with the Maneater hitmaker during her show on Sunday.

A 20-man brawl ensued, in which Timati lost a tooth.

The star later raged: "I know who was behind it. They will be punished."

An unnamed venue official says, "We learned at the last moment he was going to perform with Furtado."

"I gave the order not to let him on stage."