Sharon Osbourne throws food at Jonah Hill’s brother… Macklemore apologizes to Kendrick Lamar… NeNe Leakes allegedly took cocaine during RHOA… Is Selena Gomez dating Austin Mahone?… and Justin Bieber turns himself in for an assault charge

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Jonah Hill’s brother, Jordan Feldstein, is a pretty big deal in the music business, managing Maroon 5, Robin Thicke, and — until this weekend — Sara Bareilles. At Clive Davis’ pre-Grammy party, Jordan was sitting at a table with Sara, Taylor Swift and Kelly Osbourne when he said something about Jack Osbourne and his wife. Kelly was livid and stormed away from the table. That’s when mama Sharon walked up, pointing her finger and screaming at Jordan. She then dumped a plate of food in Jordan’s lap and as he hurried away from the table, Sharon threw a bottle of water at his head! Apparently, Sara took the Osbourne’s side in this and fired Jordan as her manager.

Kendrick Lamar was nominated for seven Grammys but walked away with none. A lot of people — including Macklemore — were upset when Macklemore beat him in the biggest rapping categories. Macklemore even apologized for “robbing” Kendrick, saying, “It’s weird and sucked that I robbed you. I was even gonna say that during the speech. Then the music started playing during my speech and I froze.” When XXL Magazine asked Kendrick about it, he said Macklemore deserved to win his four Grammys. He said, “He did what he did…He went out there and hustled and grinded. Everything happens for a reason; the universe comes back around, that’s how it go.”

If you saw “Real Housewives of Atlanta” Sunday night, you saw things get real ugly when a fun couples’ pajama party turned violent. MediaTakeout.com is reporting that if you thought NeNe Leakes was acting like she was high the whole time, it’s because she was! They claim a production assistant on the show witnessed her doing lines of cocaine before they started shooting. She hasn’t made any comments about the cocaine allegations, but NeNe was NOT happy with how the show was edited. Sunday night she tweeted to her followers: “I won’t b tweeting during this episode because I CAN’T & WONT support violence or lies!”

Rumors are popping up again that Selena Gomez and Austin Mahone are seeing each other secretly. But Austin says don’t believe any of it because they are just friends. Really! He told “People” that he thinks she’s really pretty but every time he’s in LA, she’s like, “Hey! You’re in LA! Let’s hang out!” They are both from Texas, so maybe she just feels a connection there. But there’s another rumor that Austin is actually dating Kylie Jenner, who was there for his pre-Super Bowl concert in NY yesterday.

Justin Bieber has pleaded not guilty to charges of driving under the influence and drag racing in Miami. His arraignment isn’t scheduled until Valentine’s Day, but his attorney has already entered a written not guilty plea. Justin flew to Toronto yesterday to turn himself in for allegedly assaulting a limo driver. Last month, Justin and some buddies went to a hockey game in Toronto and then wanted to keep the party going afterward at a nightclub. A limo driver says he picked up Justin and his friends about 2:30 in the morning to take them back to their hotel, but an argument erupted and somebody started punching him in the back of the head. The driver pulled over to call police, and that’s when he says the guy who hit him took off. And he claims that guy is Justin Bieber. So Justin’s now charged with one count of assault and has to be back in court on March 10.