Jack Osbourne, the son of Ozzy and Sharon Osbourne and a mainstay of reality TV with shows including “The Osbournes” and “Ozzy & Jack’s World Detour,” was attacked Wednesday morning at a coffee shop in Studio City, Calif., TMZ reports.

TMZ says Osbourne was “the victim in a coffee shop attack — his morning cup of Joe was brutally interrupted when a random stranger delivered a blow to his head in a totally unprompted attack.”

The report cites law enforcement sources saying the incident took place while Osbourne was sitting on the sidewalk patio.

“We’re told someone who appeared to be homeless came out of nowhere and sucker punched Jack on the right side of his head,” TMZ reports. “Jack, who had his back to the street, got up and threw his coffee at the guy … who then ran away.”

Police were called to the scene and reportedly found the attacker. TMZ reports that he “struggled with cops and needed to be tazed to calm the hell down. The suspect was ultimately arrested for battery and assault.”

TMZ cites a rep for Osbourne saying he is doing just fine.