Phillip Schofield was forced to cut an interview short after a gatecrasher swore live on air.
The ITV presenter and his co-host Holly Willoughby were speaking to Simon Charles Dorante-Day, who claims he's Prince Charles' son.
Appearing via video link from Australia, Simon told viewers he is the 'secret son' of Prince Charles and Camilla.
Simon claims his grandmother confirmed he was their son after being shown a picture of the royals, the MEN reports.
Phillip shut down the claims and branded them a "stretch".
Phillip and Holly continued to question Simon on why he believes he is the son of the Prince of Wales and Duchess of Cornwall.
But the chat became more tense when royal biographer Robert Jobson was brought in to offer his views.
Robert, who wrote Prince Charles at 70: Our Future King, dismissed Simon's claims leading to the pair repeatedly talking over each other.
Phillip then waded in to offer the pair the chance to take a turn in responding to the question the presenters posed.
But the fiery interview was then cut short after Simon's wife Elvianna gatecrashed and could be heard shouting off-screen.
As they tried to carry on, Simon's wife yelled: "Stop treating indigenous people like s***!"
Phillip the instantly jumped in and said: "We'll leave it there, Simon, unfortunately."
"That wasn't very royal was it?" he fired.
Holly then added: "Sorry for any bad language you heard there," before introducing an ad break.
