The mother of three started off her night having dinner at Stack Restaurant & Bar at the Mirage with her long-time boyfriend Scott Disick, who’s hosted at 1 OAK twice so far this year, and several of her friends including Courtenay Semel, Melissa Kolker and Sarah Howard.
Afterward, she headed around the bend to 1 OAK, where she worked the red carpet wearing a skirt by Balmain, a Wolford body suit and lace-up heels by Tom Ford.
Inside the club, Kardashian and her girlfriends landed a VIP table with champagne and mixed Grey Goose cocktails, as well as a four-tier cake, a magnum bottle of Dom Perignon and head cutouts of Kardashian and Disick.
Disick got on the mic to wish his partner a happy birthday.
Other notable celebrities at 1 OAK included R&B legends Boys II Men, who were filming for an upcoming music video.