The former couple each paired the GG Marmont Medium Quilted Shoulder Bag (which retails for $1,980) differently, with Kris holding it as a clutch alongside her stylish black pantsuit. Caitlyn draped the bag over her shoulder, as she sported a sparkly mini dress.
Kris and Caitlyn were photographed arriving to Kylie's party separately, though a source told ET that they had fun mingling during the bash with Kris' boyfriend, Corey Gamble, and Caitlyn's rumored girlfriend, Sophia Hutchins.
Kylie, meanwhile, couldn't have appeared to have a better time at the star-studded soiree, which continued into the early hours of Friday morning. After a good night's sleep, she woke up on Friday to a fancy gift of her own: a vintage Rolls-Royce from her boyfriend, Travis Scott.
See more on the youngest Kardashian-Jenner's big birthday in the video below.