Adam Lambert was corrected by Linda Robson after swearing on Wednesday's instalment of Loose Women.
The Starstruck judge was talking about his career before landing the role on the show when he used the swear word.
Starstruck follows members of the public as they transform into some of the world's biggest music icons.
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Katie Piper said: "You've been there, you have worked very hard, you're living people's dream but you have worked for it."
Adam replied: "I remember being in their position with American Idol, I remember being on stage and having people look at you and you have to be able to kind of laugh it off and take the p*** out of yourself."
Nadia Sawalha could be heard laughing, and Linda said: "I don't think you was allowed to say that word, but never mind."
Adam squirmed as he said: "Oh no", and Linda admitted: "It's normally me".
Viewers were quick to notice his slip up.
Taking to Twitter, ShakyWoon said: "Adam Lambert said the p word on Loose Women! Oh dear..."
Missohola said: "I love Adam Lambert so much, I've seen him live and he is out of this world! And he just swore on live tv haha"
cb_038 said: "Linda telling Adam off for swearing!"
Carole Carter said: "He said p***!"
Loose Women airs weekdays at 12.30pm on ITV and the ITV Hub
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