Holly Willoughby wore a 1960s bunny girl corset under her wedding dress when she married Dan Baldwin.
The nation's sweetheart shared her naughty secret on her lifestyle brand Wylde Moon's Instagram.
Holly, 41, said how "no one knew" that under her white gown was more than a frilly garter.
During a Q&A she was asked to share something about her wedding that no one knew, which prompted her to share her hidden outfit.
"It's obviously very important to get your underwear right under your wedding dress, and even more so with a backless dress," she explained.
"My amazing dressmaker had a vintage pattern for a bunny girl outfit.
"She adapted a 1960's original bunny girl corset by cutting the back so low, it didn't show," she continued.
The presenter joked: "She even made me a fluffy tail – but I’m not sure that ever saw the light of day!"
She and Dan will be celebrating 15 years of marriage next month after the pair met on the ITV show Ministry of Mayhem.
This isn't the first time Holly has ditched her cheery daytime TV persona to reveal her cheeky side.
In an interview in 2009 she said how she likes wearing six-inch heels in the bedroom.
But the TV beauty also wears the shoes for practical reasons too as she says she likes to break them in.
"I love wearing new shoes during sex ‒ and not just because it’s kinky," she said.
The presenter has a "rule" that as soon as she buys herself a new pair of shoes, she'll wear them for Dan first.
“I’m not a foot fetishist or anything, and I do enjoy saucy games with my hubby, but I have found the best way to break in new shoes is to wear them during sex.
“It’s become a sort of rule whenever I get a new pair of shoes.
“I always wear them in the bedroom ‒ during the sex act ‒ before I take them outside."
She also revealed that she dresses up as a "sexy secretary" for Dan, who she married in 2007.
And sometimes on date nights, she would wear just a coat, with nothing underneath.
On an episode of Celebrity Juice, Holly was often egged on by best pal Ferne Cotton and Keith Lemon to show her naughty side.
During a challenge she was asked to list three things that she liked having in her mouth, to which she replied: "I like chocolate, and I like fruit, and I like wine.”
Always taking things one step too far, Keith then asked what things she wouldn't put near her bottom, and she said she wouldn't go near Dan's penis... or a carrot.
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On one episode of This Morning she refused to talk about her and Dan's sex life with Dawn Ward from The Real Housewives of Cheshire.
Holly said: “I am not part of this. This is not something anyone needs to know.
“I can be honest with my friends but I am not going to talk about this on air.”
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