Jack Fincham was reportedly terrified ex 'father-in-law' Danny Dyer would show up to watch him get his kit off for All New Full Monty: Who Bares Wins.
The Love Island winner was dating the EastEnders actor's daughter Dani Dyer at the time of filming.
Pals say Jack, 26, was concerned prankster Danny would turn up and flash him from the front row as a joke.
A source close to Jack told The Sun: "He was really nervous."
But luckily for Jack, Danny wasn't there on the night with former girlfriend Dani cheering him on from the audience instead.
Dani Dyer hits back at accusations she faked her romance with Jack Fincham
Jack and Dani broke up last month following months of speculation about their relationship.
Shortly before the break-up, Jack joined the brave line-up of famous faces in getting their kit off in the name of charity.
The All New Monty: Who Bares Wins airs at 9pm on ITV on Monday May 9.
The women's version, featuring Love Island's Megan Barton Hanson and Coleen Nolan airs the following night on May 10.
It promotes cancer awareness by encouraging men to get checks for prostate and testicular cancer, while women are urged to check their breasts and get regular smear tests.
Jack's Full Monty co-star Emmerdale actor Kelvin Feltcher joked that competition was strong between the guys when it came to who had the biggest bulge.
He said: "There is one competition. But there’s already a clear winner for that. I think that’s probably the one we all wanted to win but from day one it was obvious."
While he didn't name any names, Kelvin later clarified it was Jack he was complimenting.
Copying the What's on TV interview to Instagram , Kelvin wrote in the caption: "Naming no manes (@Jack_charlesf)."
*The All New Monty airs tonight at 9pm on ITV
