They are known for passing  judgment on nervous amateur entertainers in Britain’s Got Talent.

But this is the moment Amanda Holden and Piers Morgan took to the stage themselves – at a remarkably star-studded school show.

Morgan looked uncharacteristically pious in his nun’s habit for the Sound Of Music skit, alongside the similarly divine-looking ITV chairman, Michael Grade. They were joined by American TV host Jerry Springer – in the unlikely guise of a Catholic priest.

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Bad Habits: Michael Grade and Piers Morgan as nuns, with Jerry Springer as a priest - while Amanda Holden maintains her dignity

All three gave a spirited rendition of Climb Ev’ry Mountain to the stunned audience at Thomas’s School in Clapham, South London, while Miss Holden treated them to her version of The Lonely Goatherd – complete with yodelling.

‘Amanda was fantastic but singing isn’t exactly the word I’d use to describe what Mr Grade and I were doing,’ Morgan joked.

Morgan’s 11-year-old son Stanley and Grade’s nine-year-old son Samuel are both pupils at the school, while Springer was roped in after appearing on ITV1’s This Morning alongside Miss Holden earlier in the day.

‘It was probably the craziest line-up ever seen at a school show,’ Morgan added.

‘I asked Jerry if he fancied making an idiot out of himself in front of a load of kids for charity and he agreed. The audience couldn’t believe it when they saw him.

‘He got really into it. It went down extremely well and was a wonderful way to repent our sins.

‘Jerry said his rabbi would be proud of him. For my part, I’m a Roman Catholic and I felt very comfortable in a nun’s habit.’

The performance wasn’t the only contribution Grade and Morgan made to the event, which raised £35,000 for the CAIRN Trust to help deprived children in Nepal.

The pair will now have to act as butlers at a dinner party, after a fellow parent won their services in a charity raffle.