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After celebrating her 36th birthday in Las Vegas, Kourtney Kardashian was back to mommy duty and she shared on Instagram a photo of herself pumping breast milk on kitchen counter. The image showed the celebrity mother posing seductively with her breast pumps on. "What happens in Vegas stays in Vegas," so she captioned the pic.

Kourtney gave birth to son Reign Aston, her third child with longtime partner Scott Disick, in December last year. The baby boy joined brother Mason Dash, 5, and sister Penelope Scotland, 2. Last month, the mother of three also shared a photo of herself using breast pumps.

Turning 36 years old on Saturday, April 18, Kourtney had a celebration with Scott and a group of friends at 1 OAK in Las Vegas. The birthday lady shared some photos from the affair on her Instagram, two of which showed her posing with female friends on the dance floor.

About last night.

A photo posted by Kourtney Kardashian (@kourtneykardash) on Apr 19, 2015 at 10:41am PDT

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About last night.

A photo posted by Kourtney Kardashian (@kourtneykardash) on Apr 19, 2015 at 10:36am PDT