March 23, 2015 11:15 AM

As a working mom, Kourtney Kardashian is pulling double duty — literally!

After hanging out at the Marquee Dayclub in Las Vegas, the reality star took to Instagram on Saturday to show her fans how she manages to continue nursing 3-month-old son Reign Aston even when she’s away from home.

“After the show it’s the after party,” she captioned the shot of her pumping in a breastfeeding-friendly bra.

In addition to spotlighting her nursing skills, Kardashian, 35, also showed off her svelte body after baby in matching black undergarments.

Courtesy Kourtney Kardashian

The trip was a quick getaway with her gal pals, she told PEOPLE at the event. “We keep calling ourselves the mom-kabobs,” she joked. “It’s all my close girlfriends. It’s the fastest Vegas trip ever.”

But this isn’t the first time the mom of three — she and boyfriend Scott Disick are also parents to daughter Penelope Scotland, 2½, and son Mason Dash, 5 — has used her Easy Expression Bustier from Medela.

In Kourtney & Khloé Take Miami, Kardashian used her black bra to pump and dump milk after a night out partying.

— Anya Leon

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