Phil and Holly were forced to apologise to viewers on This Morning, after guest Andre Rieu swore live on air.
The Dutch violinist and conductor was talking about his love for music on the show, going right back to his childhood.
He was discussing two of his teachers, one who he adored and another who he hated.
READ MORE: This Morning star Holly Willoughby would 'walk off set' if golden rule is broken
The musician started by describing his 80-year-old teacher, who taught him when he was just five-years-old.
Speaking of her, he said: "I fell in love with her immediately."
Holly then asked about his second teacher - the piano teacher. She explained how Andre was given lessons in a beautiful castle.
Andre said: "I hated her. I hated the castle. I hated the piano.
"She was a b***h."
The two presenters and the guest all giggled awkwardly as Phil and Holly both said: "Oo sorry!" into the camera.
Viewers on Twitter thought the moment was quite funny.
Meg said: "I just love when guests accidentally swear on #ThisMorning."
Another user said: "Lol tell me what you really think of that b**** of a teacher #thismorning."
Ash said: "I don't know what's going on but this guy just said b**** live on air and it's not even 11am #ThisMorning" with laughing emojis afterwards.
Andre isn't the first famous face to swear by accident on the show, as other celebs who are also guilty of it include Brian Cox and Martin Clunes.
This Mornings airs weekdays at 10am on ITV and ITVHub
Receive newsletters with the latest news, sport and what's on updates from the Liverpool ECHO by signing up here.
