Kourtney Kardashian

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Kourtney Kardashian knows how to party...when it comes to being a mom.

The 35-year-old Keeping Up With the Kardashians star, who in December gave birth to her and Scott Disick's son Reign Aston Disick, their third child, posted on her Instagram page on Saturday evening a photo of herself wearing a black strapless bodysuit, which showed off her slim (and shrinking figure), and holding up a breast milk pump.

"After the show, it's the after party," she said.

Kardashian had just hosted the summer preview party at the Marquee Dayclub at the Cosmopolitan Hotel & Casino in Las Vegas. The reality star has been working hard to lose the baby weight and has documented her journey on social media. Last week, she even revealed how much she weighed.

Kardashian attended the Vegas bash with friends and wore a long sleeve, flowy animal print dress.

Kourtney Kardashian

Truscello/WireImage

Kourtney Kardashian

Truscello/WireImage

The reality star...yep...pumped up the crowd as she appeared in the DJ booth, where she set off the first fireworks of the Dayclub season with headliner Cash Cash and snapped a giant group selfie.

Kourtney Kardashian

Denise Truscello/WireImage

Watch an all-new episode of Keeping Up With the Kardashians on Sunday, March 22 at 9 p.m. ET!

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