'She Should Be Really Scared!' Chelsea Handler Fires Back After Heather McDonald's Monster Boss Claims

As Star previously reported, Heather, 45, claimed that she "lived in fear" during the show's seven-year run — and that she was let go without severance!

Now, Chelsea, 40, took to Jenny McCarthy's SiriusXM Radio show to have her side heard!

The funny girl explained that she had to cut ties with Heather due to her obsession with fame, saying, "she exchanged stories to US Weekly in exchange for them running her photo when she was working on my show. That's why I stopped talking to her. I could have fired her but instead, I just stopped spending any personal time with her."

"The fact that I would allow someone like that to even work for me when everybody was telling me to fire her, and she's complaining that I wouldn't hang out with her or discuss my negotiations," the Are You There Vodka? It's Me, Chelsea author continued. "Why the f**k would I tell somebody who's talking to a magazine about my career?"

"She would never say anything my face. She would only say that on the radio," she fumed.

And she didn't leave Jenny's show without making sure she cut off all hopes of a reconciliation.

"She would never because she's f***king scared and she should be. Now she should really be scared," she threatened.