Ant McPartlin has revealed he and his comedy partner, Declan Donnelly, were once told off by the King's staff while staying overnight at Dumfries House in Scotland.
The pair were reflecting on an ITV special they recorded in 2006, which followed Charles, the then-Prince of Wales, for a programme celebrating 30 years of The Prince’s Trust.
The charity, which is now called The King’s Trust, helps young people under the age of 30 to learn life skills and gain employment.
Mr McPartlin recalled: “We were asked if we would like to spend the night at the house ahead of the final interview. We were like 'hell, yes!' It was amazing and everything you'd imagine.”
Ant McPartlin has revealed he and Declan Donnelly had to be warned by King Charles's staff at Dumfries House
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He went on to reveal he “got on really well” with the the royal, saying the experience was “bizarre and unforgettable".
Mr McPartlin also opened up on an awkward experience with the King, saying: “I tried on the robe that was in my room and ran out into the corridor to find Dec and there was the Prince. He said 'hello' and started talking to me about pruning roses. I was so embarrassed.”
However, the moment that caused royal staff to intervene happened later in the night.
Mr Donnelly stated on The Graham Norton Show: “We then had wine in the room and got a bit noisy. We took it a bit far and were asked to be quiet.”
The revelation comes as the monarch recorded a special message for The King’s Trust, which is celebrating its 50th anniversary this year.
In the video, he said: “Over the last 50 years, the work of my trust has proved beyond doubt that supporting young people through personal development and the acquisition of self-confidence and self-esteem can make a real difference and transform lives."
King Charles has spoken on his pride as his charity reaches it's 50th anniversary | GETTYThe organisation came into being during a turbulent era marked by record joblessness, soaring inflation and widespread civil unrest across Britain.
Charles used his £7,400 severance payment from the Royal Navy to establish the initiative, channelling the funds into various community projects designed to support struggling young people.
What began as a modest endeavour has since grown into one of Britain's foremost youth organisations, with research indicating the trust has generated at least £11.4billion in societal value over its five decades of operation.
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An anniversary impact report titled 50 Years Of Working For Young People is scheduled for release next week.
The trust's impact has been substantial, with more than 1.3million young people receiving assistance since its inception.
Additionally, some 92,000 individuals across the UK have been supported in launching their own businesses through the charity's programmes.
Idris Elba has previously spoken on how The King's Trust helped him | GETTYThe organisation boasts an impressive roster of celebrity ambassadors who champion its work, including former England football manager Sir Gareth Southgate and Ant and Dec themselves.
Actor Sir Idris Elba has spoken publicly about how the trust provided him with a life-changing opportunity during his early career.
Charles expressed his satisfaction at these achievements, noting he was "so very pleased, and proud, that the trust's work continues to go from strength to strength".
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