Comedian Joan Rivers turned the air blue during a live U.S. TV interview on Tuesday morning when she swore at a presenter for cracking a joke about her daughter.
The 76 year old appeared on Good Day Sacramento to promote her new show How'd You Get So Rich?, but the funnywoman wasn't laughing when one interviewer made a quip at her 41-year-old TV presenter daughter Melissa's expense.
The male TV host asked Rivers, "Ever run up to someone and say, 'Hey, how did you get so rich?' and the woman replied, 'By riding on my mom's coat tails!'"
Rivers snapped and cut short the interview - but not before scolding the presenter and dropping the 'F' word.
She snarled, "I don't think so. And I think we're gonna end the interview right now. Don't get so f**king smart."
Rivers' microphone was immediately cut off and the reporter's co-hosts were left to apologize to viewers for the foul language.
Melissa Rivers has carved out a career for herself as a TV personality and an actress, with small roles in now defunct TV shows like Beverly Hills, 90210 and The L Word.
The mother and daughter duo also appeared together on Donald Trump's reality show Celebrity Apprentice earlier this year and once prowled the red carpet at big awards shows for U.S. TV specials.
It's not the first time Rivers' language has caused controversy on live TV - last year she swore on British daytime talk show Loose Women during a chat about a red carpet encounter with Russell Crowe.
She called the actor "f**king s**t", prompting the flustered presenters to apologize for Rivers' foul language. The comedienne issued an apology for her expletives - but then revoked it, insisting the British public had overreacted.
Watch the clip below (WARNING: OFFENSIVE LANGUAGE)
