Just hours after his sentencing in Los Angeles on Tuesday,
Clubgoer Cory Honickman reportedly told Us, "He stood up on the back of the booth when the song came on, got a mic and not only sang, but danced his a-- off.
"It was insane and no one could look away. He is incredibly talented."
He added that the singer, who is due to report to probation within 72 hours of Tuesday's hearing, addressed the crowd, saying, "There was only one King of Pop. We love you, Michael."
Brown, of course, is a longtime Jackson fan and his musical career shows the late singer's profound influence.
Brown's formal sentencing on Tuesday followed the terms of the plea deal the singer agreed to last month, which includes 180 days of community labor work, a year of domestic-abuse counseling and five years' probation. The judge did not lift the protective order issued against Brown, warning him that he must stay away from
"There were no surprises in court this afternoon. The court imposed the sentence," Rihanna's lawyer, Donald Etra, told reporters outside the courthouse. "Rihanna was advised of the plea agreement before it was entered by Mr. Brown. She did not object at that time. The stay-away order was imposed by the court."