Steph McGovern was forced to apologise to viewers when Matt Lucas accidentally swore on her midday show.
The former Little Britain star was on Steph's new Channel 4 programme The Steph Show, which she presents live from her home, when he was told off for swearing.
Matt, 46, was talking about his comedy coronavirus song Thank You Baked Potato, which he is releasing to raise money to feed NHS workers when he let the naughty word slip out.
He said: "But it's been amazing the song, because as you can see people have been recording their own versions and putting them up on Twitter.
"It's a bugger of an earworm and I apologise for that..."
Steph jumped in: "I'll have to apologise for your language now as well, Matt, thank you very much."
A little embarrassed, Matt said: "Sorry, sorry, sorry, naughty Matthew, naughty!
"See, baked potato needs to teach me what words I should and shouldn't say."
"Yeah not that one," Steph laughed.
One viewer found it rather hilarious though, writing on Twitter: "I loved Steph telling @RealMattLucas off for saying Bugger on #TheStephShow Naughty Matt!"
Matt also talked to Steph about his time in self-isolation and how the song came about.
He said: "Because I've got asthma I'm being really careful, I've been in the house for two and a half weeks."
Matt said he was in Chicago filming a pilot when coronavirus started getting serious and he was anxious and worried about getting stuck in the United States.
Talking about where his song came from, he said: "About 20 years ago, I used to be on this very strange panel game show called Shooting Stars and I used to sing songs and I sang a song about baked potatoes.
"About a week ago I was watching the news and saw that people were still going out and it was shocking, so I decided to re-write the song."
Matt says he posted the video on Twitter and only expected about 500 people to watch it, and was blown away when it was viewed more than three million times in just a few days.
In the meantime, he had been working on new campaign Feed NHS, and someone suggested he should release his single in aid of the initiative.
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