A high-profile skirmish between two powerful managers has left one of them with a smaller revenue stream. Jordan Feldstein has been fired by one of his clients, Sara Bareilles, after clashing with Ozzy Osbourne manager and wife Sharon Osbourne.

The Hollywood Reporter discloses that Feldstein and Osbourne clashed at Clive Davis' famously lavish annual pre-Grammy party at the Beverly Hilton. Apparently, Feldstein had made some rude comments about Jack Osbourne and his wife, which led to a row with Sharon's daughter, Kelly. Sharon, ever-protective of her family, went up to Feldstein's table to angrily confront him, and wound up dumping a plate of food in his lap and throwing a glass of water at him.

The image above was taken as Sharon threw the water at Feldstein, the brother of actor Jonah Hill ('Accepted,' 'Evan Almighty'), who's in the white shirt walking away. Bareilles is seated at the table. Note those in the background who have turned around to witness the commotion.

The next day, Bareilles broke the news to Feldstein that his services were no longer required. Feldstein, who also manages pop stars Maroon 5 and Robin Thicke, did not attend the Grammys.

As the Hollywood Reporter's source says, "You don't f--- with the Osbournes."