Speaking to The Sun on Sunday, Lord Colin Campbell said he hadn't watched his ex-wife in the jungle and would rather not see her again for the rest of his life.
The 69-year-old said: "She can seem charming and lovely but in my opinion she is a monster. I think she's a crushing snob and a complete fake. She keeps claiming to be related to the Royal Family through me. How does that work? I am not related to the Queen, not at all."
Lord Campbell also said he was "infuriated" that his former wife, 66, still used his name and title following their divorce in 1975 and added that he would gladly never see her again. "She's bad news and I hope I never have to lay eyes on her again."
In the same interview, he also suggested the couple were "never compatible" and said Lady Colin's voice would "irritate" him. "I read it is an aristocratic accent. Well, it's not like any I have ever heard."
As Lady C is currently cooped up in the Australian jungle, she has not been able to respond to her ex-husband's claims.
Lady Colin's son Dima, however, has spoken out in a recent interview to defend his mother, saying she only lost her temper with campmates when she was pushed on something she'd made clear she didn't want to do or discuss.
"My mum is a lioness - cross her and she will pounce," he told Daily Mail. "She's a survivor and she's a fighter and she will get her way no matter what."
He also said his mother puts her children before anything else and is a devoted and loving parent. "My mum always made sure that anyone who loved her had to love us just as much. She made that very clear. That's why many of them were very quickly rejected from her life. Sometimes they would come and see her and ignore us and that would be a shortcut to the exit. It was a deal breaker."