The superstar shared photos of her day out with the twins at a park in New York City, showing the three year olds happily swinging back and forth.
Proud mum Mariah can be seen standing in the middle of the swings, wearing a white fishtail gown with her trademark black fingerless gloves and oversized sunglasses.
Mariah, 44, who is married to US presenter Nick Cannon, completed her look with a cropped black cardigan and black open-toe heels.
The gown accentuated Mariah's famous curves and assets, but while she looked glamorous during her mummy duites, her heels wasn't the most practical choice!
Captioning the photo, she said: "Sinking into the rubber mats...lol."
Mariah may have been a tad overdressed for a day at the park, but we reckon she still looked rather fabulous!
Last week, Mariah shocked and surprised fans by taking the subway in Manhattan, New York, while dressed in a sparkly blue Atelier Versace gown!
The 'Hero' hitmaker documented her entire journey from walking to the station, getting on the tube and later jumping in a taxi. She even declared: "I figured, seeing as I'm underdressed I might as well take the subway!"
Reveal is now on Google Plus! Join us here for the latest pictures, fashion and celebrity news!
Watch Mariah's video for ' You're Mine (Eternal)' below: