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Heidi Klum's daughter revealed this week that she accidentally discovered her mom’s "sex closet" when she was younger and thought it was the "coolest" thing. 

"I thought it was the coolest thing ever, and I was going through it with my friends, and I was like ‘Mom, what is this? A microphone?’" Leni Klum, 19, told Alex Cooper on "Call Her Daddy" while the podcast host was interviewing the former Victoria’s Secret Angel.

She continued, "And I like really had no idea what it was, and my mom got so mad at me after. She was like ’You can’t go in my stuff!’" 

Cooper had FaceTimed the younger Klum because the supermodel had suggested her daughter would be able to "roast" her on the podcast. 

CARRIE UNDERWOOD, HEIDI KLUM SHARE RARE PICTURES OF THEIR CHILDREN: PHOTOS

Heidi Klum with daughter Leni

Leni Klum said she discovered her mom's "sex closet" when she was younger.  (Gotham/FilmMagic)

Leni said she sneaked her friends into her mom’s bedroom, so they could see it themselves. 

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"I was showing it off to my friends," she laughed. "I was like, ‘Look how cool this is. My mom has a whole cupboard. She has a whole drawer.’ And I snuck them into my mom’s room and opened the drawer, and we all were taking video, and we were like, ‘Oh my God!’" 

Leni also revealed that her mom "tans topless by the pool," and when friends would come over, "I’d be so embarrassed and like scared because usually in my friend’s families I never see their moms tanning naked at the pool, but I thought it was normal. And my friends would always be like, ‘Hmm,’ like standoffish, but it was just so normal in our family." 

Heidi Klum smiling with Leni

Leni Klum also revealed that she was "embarrassed" by her mom tanning topless by their pool when friends would come over.  (Randy Shropshire/Getty Images for The Art of Elysium)

Cooper joked that "all of a sudden all of the boys at your school are like, ‘We want to go to your mom’s house.’" 

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Earlier in the podcast, Klum discussed tanning topless in her garden, although she claimed she would always cover up when Leni’s friends came over. 

"My kids will say, 'My friend is coming over, Mom, put your top on,' and I’m like, ‘When have I ever not had a top on when your friend was coming over? Of course, I will,'" she laughed. "But they always make sure. ‘Mom, just a little warning,’ and I’m like, ‘Don’t worry.’ I also don’t want to flash anyone just to flash someone. I just don’t love tan lines." 

Heidi Klum smiling

Heidi Klum said she tans topless in her garden because she hates "tan lines." (Matt Winkelmeyer/Getty Images for MRC)

She added, "If it’s gorgeous outside, and it’s boiling hot, and no one is around, I have my top off in my garden. I have no neighbors. It’s like no one can see anything, so off it goes." 

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Along with Leni, whose biological father is Italian businessman Flavio Briatore, Klum shares Henry, 18, Johan, 17 and Lou, 14, with ex-husband Seal.