Mariah Carey Hits the Gym in Heels and Fishnets -- and Even Rihanna Is Impressed

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Mariah Carey just skipped the athleisure trend altogether and went straight for glam-leisure.

The 46-year-old singer hit the weights and the stair climber at celebrity trainer Gunnar Peterson's gym on Thursday night, but did not change into sweats while working on her fitness. Instead, Carey wore fishnets, a cleavage-baring leotard, a gold statement necklace and FENTxPuma heels, which cost between $375 and $600.

WATCH: Mariah Carey Rocks Sexy Lingerie Looks, a Bridal Garter in Cover Art for New Breakup Single ‘I Don’t’

In one video posted to Instagram, Carey is seen playfully "running amok" through the gym, while in another, she's casually lifting weights. "We must we must," she wrote, referring to the rhyme "we must, we must, we must increase our bust."

In her final post from the gym, Carey is seen sexily posing on a stair climber. "Climb every mountain," she wrote.

Rihanna regrammed this photo, excited to see that Carey was wearing heels from her Puma collection. "Yo I made it!!! @mariahcarey in #FENTYxPUMA," she quipped.

WATCH: WATCH: Mariah Ditches Her Engagement Ring, Says She's 'Really Happy' With Boyfriend Bryan Tanaka

Carey recently released a new breakup song, "I Don't," after calling off her engagement from James Packer. "Said you would always be mine, feeding me nothing but lies," she sings. "I was so gone, I admit it. Happy messed up for a minute."

Check out her "I Don't," and what the GRAMMY winner had to say about releasing even more new music:

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