"What happens in Vegas stays in Vegas," Scott Disick's significant other captioned the pic of her posing on top of a counter while taking care of her mommy duties. Scott joined her for the Sin City festivities, and luckily, he seemed to be on his best behavior for once, reportedly sipping water the whole night.
The couple carried giant cardboard cutouts of their heads for the party, but celebrated back in LA with their family and kids on Sunday. Kourt shared a photo of herself holding Penelope and tasting her gorgeous cake made by her own mom Kris Jenner as Mason and Kendall looked on.
Happy birthday, Kourtney!
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Gallery | Kourtney Kardashian and Scott Disick: A Look at Their Love