Chris Brown is facing a possible criminal investigation for violating his probation after the crooner hit up a Los Angeles nightclub following his sentencing for beating up ex-girlfriend Rihanna. Chris broke the rules of his probation as he was too young to be in the 21 and up establishment. The disgraced R&B star faced an LA Superior court judge on Tuesday as he was given a five year probation order, as well as six months hard community labor after he was convicted of assaulting his popstar ex last February.

The “Kiss Kiss” star shocked fans by embarking a night out on the town at West Hollywood hotspot Guys and Dolls earlier this week. He even grabbed the mic during Michael Jackson’s hit Dirty Diana and told the crowd: “There was only one King of Pop. We love you, Michael.”

Los Angeles Probation Department spokeswoman Kari Webb tells E! News: “It (breaking probation) won’t be taken lightly. If you break the law, you’re in trouble.”