The US comic turned the air blue when asked about her experiences interviewing celebs.
You get someone like Russell Crowe and you want to say to the camera that he's a piece of get ready to bleep this f***ing s***.
The controversial star insists she thought her swear words would be edited out.
After the host apologised for her bad language, Joan, 75, was removed from the set during a commercial break.
She has since apologised for the blunder.
Yes, I swore and I'm so f***ing sorry, she tells People. No one told me the TV show Loose Women was a reality show and that I would be voted off.
'It's funny: off stage, I hardly ever use profanity. My favourite4-letter word is shop.
Watch the video below - but be warned - it's the uncut version!