Channel 5 confirmed on Monday evening (11 january) that Jonathan, who stars on Keeping Up With The Kardashians, has decided to leave after less than a week in the house.
A Channel 5 spokesperson said: "Jonathan Cheban has decided to leave the Celebrity Big Brother House. His exit will appear in tomorrow night's show on Channel 5 at 9pm."
Just two days ago, Kim Kardashian's BFF threatened to leave house, saying he feared staying in the compound any longer could give him a heart attack.
The American reality star complained of "claustrophobia" as he spoke to Big Brother in the Diary Room.
Former Hollywood publicist Jonathan said on Saturday night's show: "I'm not feeling so great at this point. Right now I'm feeling edgy and claustrophobic... there is a point where my mental stability is more important than entertaining.
"Right now I'm definitely a bit torn on whether to stay in the house anymore, I've reached a point where I don't know if I want to stay anymore."
He continued: "I need to get out of here. It's becoming impossible. I can't even sit. I can't even enjoy it. I can't even hear anybody, I'm so anxious I feel I'm going to have a heart attack."
After a long talk with producers, Jonathan decided to stay and give it another chance. However, just two days later, he has now quit for good.
Jonathan's exit makes him the first celebrity to leave the house this series. He struck up a friendship with former TOWIE star Gemma Collins in the house, but he also found himself clashing with Angie Bowie.
He also made some surprising confessions in the house. He admitted that he had never used a toaster before, saying he didn't even know that a toaster is meant to toast bread on both sides.
Following questions from housemates, Jonathan also talked about the "crazy pandemonium" of the Kardashian world, explaining how manic it is to film Keeping Up With The Kardashians in public.
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