February 14, 2014 10:00 AM

Evan Agostini/Invision/AP

Mariah Carey has collaborated with everyone from Whitney Houston to Jay Z. But her cutest featured artists are yet to come: her kids!

That’s right. Dem babies — 2½-year-old twins Moroccan and Monroe — will make their recording debut on their superstar mom’s upcoming album, out in May.

“It’s a song that I wrote with Bryan-Michael Cox and Jermaine Dupri. There’s a part that Jermaine says on the song that [the kids] loved, and Monroe started to say it,” Carey told PEOPLE at the Empire State Building’s Love Above All lighting ceremony in New York City Thursday.

“I kept having to get my iPhone and record her. So I have all these different takes of her saying things, singing things. Then I’d be like, ‘This is your new ad lib — learn it!’ I have to make it fun for her.”

Carey isn’t the first diva to feature her child on a new track, though. Beyoncé‘s daughter Blue Ivy, 2, appeared with her on “Blue” in December.

Carey debuted her latest single “You’re Mine (Eternal)” at the 2014 BET Honors. The performance attracted quite a bit of buzz — mostly because of the singer’s barely-there gown.

“I was [worried about a wardrobe malfunction] when I laid on the piano,” she says. “Right before the lights went on me, I heard ‘Pop! Pop! Pop!’ The supposedly see-through wires broke. Nobody saw anything, and it was by the grace of God that I got through the performance.”

The singer’s done her fair share of performing over the years. But does she see music in her kids’ future?

“Well, they started singing and talking simultaneously. It’s hard to explain. That sounds like a lie, but it’s true,” she says. “They’re both so musical.”

When they’re not in the recording studio, Carey says the twins love spending quality time with their mom.

“Their favorite thing is: ‘Lie down, Mommy.’ Meaning: ‘Lay with me and watch a movie,'” she says. “Because otherwise they have to watch Your Baby Can Read or something educational. I’m a tough task-master like that.”

— Jeff Nelson

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