Sharon Osbourne got into a fight with Jonah Hill's brother on Saturday night.
The 61-year-old star reportedly got into an explosive confrontation with the 'Wolf of Wall Street' star's music brother manager, Jordan Feldstein, and began hurling food at him after he argued with her daughter, Kelly Osbourne, at Clive Davis and The Recording Academy's pre-Grammy gala at the Beverly Hilton Hotel in Los Angeles.
An eyewitness told E! News: "There was a lot of finger pointing."
'The X Factor' judge went over to Jordan's table after she saw 'Fashion Police' host storming off "and the arguing continued."
The source added: "They were going back and forth and then all of sudden, food was flipped onto Jordan. He got up to walk away and then Sharon threw a glass of water at him."
While the reason for the argument is not yet known, another insider confirmed that the Osbourne family have a long-standing feud with 35-year-old Maroon 5 manager Jordan, who hit the headlines in November when he married Clint Eastwood's daughter Francesca, 20, in an impromptu ceremony in Las Vegas before filing for an annulment a week later.
Rihanna, Taylor Swift and Jared Leto were among the other guests at the gala, during which Miley Cyrus, Pharrell, Jennifer Hudson and Robin Thicke performed.