Tom Fletcher has given fans a glimpse of his outfit ahead of this week’s Strictly Come Dancing.
The McFly singer revealed he will be sporting a tiny beige thong which he described as "elf underwear" as he prepared for Musicals Week with professional dance partner Amy Dowden.
Sharing clips of the pair training in the studio, the 36-year-old giggled as he gave his 2million Instagram followers a close-up of the tiny garment.
"Are you ready for Musicals Week? We have such a good one," he said in the video clip.
An excited Amy chipped in: "I really, really can’t wait."
"The guitar’s not in it!" Amy told fans as Tom panned the camera down to reveal a black guitar lying on the table.
As Amy strummed the guitar, Tom continued: 'No this is not in it. Although, what I will say is, I'm wearing a thong for Musicals Week."
Amy burst out laughing as Tom held up the teeny thong to the camera, before clarifying he would be in fact be wearing the garment on his feet.
"It’s like a little elf – it’s like elf underwear!" Tom said as he also burst into giggles: "What are they?'
"This is the bottom, they are the bum cheeks," Amy joked holding it up to the camera.
Putting the thong against his trousers, Tom said: "I don’t think it’s going to fit Ams."
Amy hit back: "I think your boys are going to laugh at this," and Tom agreed: "Yeah, my kids are going to love these."
It's not the first time Tom has worn a thong during his time in Strictly – although never on stage.
Before the show started, the boy band star revealed he wore a tiny black paper thong to get the obligatory Strictly spray tan.
Sharing a topless selfie, the dad-of-three held up the disposable thong to the camera, captioning the post: "The Strictly spray tans have begun...and yes, I wore these @bbcstrictly."
Fans were quick to comment on the post, with many marvelling at Tom’s "sexy" abs.
A few weeks into the show, the singer said he had lost so much weight from the intense training every day that none of his clothes fit any more.
Speaking on ITV's Lorraine, he said: "I definitely am [in the best shape of my life]. None of my clothes fit anymore. It's such a workout dancing every day."
The star said Amy had not only taught him to dance, but his wife Giovanna and their kids; Buzz, seven, Buddy, five, and three-year-old Max, too.
"It's amazing because we're kind of getting to do the Strictly experience together as a family, which is really nice.
"Giovanna kind of picks it up quicker than I do, which is a little bit annoying."
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