Minus Kim, who was attending the funeral of Kanye West's grandfather in Oklahoma, sisters Kourtney, Khloe and Kendall were suitably glammed up for the occasion.
Khloe arrived in a black blouse, matching trousers and bunny ears, while Kourtney rocked a quirky monochrome dress with platform heels. Kendall, meanwhile, sported a long black sleeveless dress with a thigh high split and a tiny red party hat.
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The birthday girl herself arrived with her friends in a camouflage onepiece, taking to Instagram later on in the evening to show her real outfit – a sleeveless black crop top and black leather skirt.
The family was joined by fellow famous guests, including Kylie's rumoured boyfriend Jaden Smith, actress Hailee Steinfeld and Glee star Naya Rivera.
The entertainment was provided by surprise performers Drake and Big Sean, much to the delight of Kylie, who shared a short Instagram video of Drake putting one of his gold chains around her neck while he performed.
"This happened," she wrote alongside the short clip.
While Kanye was not able to make the party, it seems he might have been behind the big surprise, with Kylie's mother Kris Jenner writing on Twitter, "Wow wow what an amazing night @kyliejenner I hope you had the most wonderful birthday. Thank you Drake AKA @champagnepapi @bigsean for the surprise performances!! Love you Kanye."
Kylie also showed her gratitude to the hip-top superstars, writing,"DRAKE & BIG SEAN what?! Thank you guys so much Thank u to everyone who came to my party and making my night so special HAD THE BESTT NIGHTTT."
Kim, meanwhile, shared a picture of herself posing with the Instagram founder Kevin Systrom. "Chilling with the creator of Instagram @kevin," she captioned the snap.
It was the second celebration for Kylie, who enjoyed a family dinner earlier in the week.
The Kardashian-Jenner clan held a private party at Malibu's swish sushi restaurant Nobu.