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While celebrating her 36th birthday in Las Vegas on Saturday (April 18), proud nursing mama Kourtney Kardashian took the time to pump some breast milk.

The mother-of-three posted an Instagram photo of herself wearing a breast pump while posing on a counter. “What happens in Vegas stays in Vegas,” the Keeping Up with the Kardashians star captioned the image.

Kourtney gave birth to son Reign Aston in December. The reality star and her longtime beau, Scott Disick, are also parents to son Mason Dash, 5, and daughter Penelope Scotland, 2.

Continue looking through our gallery to see shots of Kourtney celebrating her birthday in Sin City, where she partied at 1 OAK nightclub with Scott and a group of gal pals.

What happens in Vegas stays in Vegas.

A photo posted by Kourtney Kardashian (@kourtneykardash) on Apr 19, 2015 at 11:17am PDT

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