Kylie Jenner doesn't turn 19 years old until Aug. 10, but the reality TV star is already getting a head start on the festivities. On Sunday, Kylie mixed business with pleasure at her birthday bash — which also doubled as her Kylie Cosmetics birthday edition [1] launch party — at the Nice Guy restaurant in LA. Kylie, of course, drew eyes in a sheer lace jumpsuit and arrived with boyfriend Tyga [2] by her side. Also in attendance were Kylie's sisters, Kendall Jenner and Khloé, Kourtney, and Kim Kardashian [3]; mom Kris; and family friends Hailey Baldwin and ASAP Rocky. If Kylie's celebrations are anything like last year's [4], then brace yourself for an action-packed week.