R&B star Ray J was detained by Las Vegas police on Sunday after fighting with rapper Fabolous.
The singer-turned-reality TV regular was in Sin City for boxer Floyd Mayweather, Jr's Saturday night bout with Victor Ortiz, after appearing in an episode of TV documentary 24/7, which chronicled the road to the big fight.
Fabolous made fun of Ray J's cameo, in which he is shown playing the piano in Mayweather, Jr's living room and singing his song One Wish.
The rapper wrote on Twitter.com, "Floyd saying we havin (sic) a concert in my living room & the camera cuts to Ray J singing 'One Wish' on the piano had me in tears!!"
The tweet infuriated Ray J and a chance meeting between the pair on Sunday sparked a heated exchange, which turned violent. Rumors suggest Fabolous got the better of Ray J, who reportedly threw the first punch at the luxury hotel and casino, Palms Las Vegas, before police intervened and handcuffed Brandy's younger brother for his bad behavior.
An angry Ray J called into Los Angeles radio station Power 105 on Monday morning to clarify the reports, insisting he was the one who punched Fabolous in the face.
He said, "It's like, don't disrespect me and Floyd like that, so when I seen him (sic) I was with Floyd and 50 (Cent, rapper) and he (Fabolous) tried to say, 'Don't touch me', and I touched (punched) that n**ger..."
Ray J continues, "I got detained... I got kicked out of the motherf**king Palms hotel! Police arrested me, handcuffs..."
Authorities in Las Vegas insist Ray J was not formally arrested and he was soon released without charge.