Phillip Schofield and Holly Willoughby as things got tense over scones on This Morning because she didn't like the way he was cutting his.
Phil said 'shut your face' as he prepared to scoff the treat while they discussed pressing royal issues in a fittingly British way.
They had been debating the comments made by Prince Harry on Monday's show with journalist Camilla Tominey and flamboyant author Giles Brandreth.
They soon found time for scones, though, but Holly wasn't happy.
During the next segment, she expressed her dismay at the way Phillip was cutting his cake and refused to let it slide.
She asked: "What are you doing? Why?"
But she should have known better – Phil grew up in Cornwall, and is very protective about the classic dish.
He replied: "Shut your face. You're giving me a hard time for cutting this and…"
Unimpressed, Holly then told him: "It's fine. Tuck in."
He had just defended Prince Harry following the fall out from his podcast appearance – and says he has no support whatsoever.
Harry recently appeared on Dax Shepard's Armchair Expert podcast where he opened up about being raised by his father Prince Charles.
He compared his life to Jim Carrey's classic film The Truman Show, where the main character's life is broadcast to the entire world without him knowing.
Many have hit out following the interview, but he has an ally in This Morning host Phil.
The presenter said: "When you listen to the podcast, you see the headlines. He talks about The Truman Show, big headline!
"But he was fed that line, there was a lot that was very unfair. I thought he was incredibly eloquent over mental heath.
"I went in thinking 'oh Harry do shut up' but I came out thinking 'good on you'.
"He said he is damned if he does and damned if he doesn't."
Phil went on: "There are times when some of the things he says are unwise, you don't want to upset your grandmother because she has just buried her husband.
"But you can't talk about mental health without talking about your own background.
"But he has no support whatsoever."
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