Chelsea Handler fired back at former costar Heather McDonald

Chelsea Handler's gloves have officially come off.

The comedian fired back at former “Chelsea Lately” co-star Heather McDonald, following claims that Handler had been a horrible boss.

“She would never say anything to my face. She would only say that on the radio,” Handler, 40, explained on Jenny McCarthy's Sirius XM radio show Tuesday. “She would never, ’cause she’s f—–g scared and she should be. Now she should be really scared.”

McDonald, 45, who worked on the E! series as a writer from 2007 to 2009, revealed on Matt Cole Weiss and Theo Von’s podcast that she discovered Handler’s show was coming to a close via social media, though she was too terrified to confirm the news with her employer.

“I lived in fear, 100 percent fear. I enjoyed my time there, I was happy, but something could happen and my heart would be beating and I’d be like, ‘Is this it,'” McDonald shared.

“I think she’s a good person, I don’t agree with how she treats relationships in her life,” she continued. “I think she’s missing out by dumping people.”

Handler, whose A-list circle of friends includes Jennifer AnistonCameron Diaz and Gwyneth Paltrow, ultimately slammed McDonald’s allegations.

“I could have fired her, but instead I just stopped spending any personal time with her,” Handler said. “The fact that I would allow anyone like that even work for me when everyone was telling me to fire her — and she’s complaining that I wouldn’t hang out with her? Or discuss my negotiations?”

“Why the f–k would I tell somebody who’s talking to a magazine about my career? She’s a writer! You don’t talk to writers about what you’re doing! That’s none of her business,” she vented.

Though Handler is now focused on what’s ahead, including her upcoming series on Netflix, the late-night diva wished that McDonald had handled her “fear” more appropriately.

“I mean, yeah of course, a million things happen, you’re at work, you’re not a nice person every day. But never like that,” Handler noted. “You can’t be scared to be at work, this isn’t a concentration camp. You should quit then. Go quit.”

This article originally appeared in the New York Post's Page Six.