Popsugar Celebrity Kylie Jenner Kylie Jenner's 21st Birthday Photos Kylie Jenner Turned 21, and You Can Bet There Was Plenty of "Birthday Behaviour" 11 August 2018 by Tori Crowther First Published: 10 August 2018 It’s our 21st birthday A post shared by Khloé (@khloekardashian) on Aug 9, 2018 at 11:09pm PDT Kylie Jenner has officially turned 21. It's safe to say she's accomplished a fair amount in that time: she's a new mom, has an incredibly successful makeup line, and according to Forbes is set to become the youngest-ever "self made" billionaire. So you can bet she was going to celebrate hard. The youngest in the Kardashian/Jenner clan was surrounded by her family and friends for a long night of partying, and the sisters all seem to be getting in on the act, with Khloe joking that they were all celebrating their 21st. We can't decide what was more extra, the photographic evidence or the outfits? Because of course, this is the Kardashian family, and you can be there wasn't just one outfit for the whole night. Ahead, see all the photos from Kylie's night of "birthday behaviour." A post shared by Kylie (@kyliejenner) on Aug 9, 2018 at 9:50pm PDT 1 / 18 A post shared by Kylie (@kyliejenner) on Aug 9, 2018 at 9:50pm PDT 2 / 18 A post shared by Kylie (@kyliejenner) on Aug 9, 2018 at 9:59pm PDT 3 / 18 BIRTHDAY BEHAVIOR! WERE ALL TURNING 21!! A post shared by Kylie (@kyliejenner) on Aug 9, 2018 at 10:48pm PDT 4 / 18 A post shared by Kylie (@kyliejenner) on Aug 9, 2018 at 11:05pm PDT 5 / 18 A post shared by Kylie (@kyliejenner) on Aug 9, 2018 at 11:06pm PDT 6 / 18 thank you for all of my birthday wishes A post shared by Kourtney Kardashian (@kourtneykardash) on Aug 9, 2018 at 11:21pm PDT 7 / 18 It’s our 21st birthday A post shared by Khloé (@khloekardashian) on Aug 9, 2018 at 11:09pm PDT 8 / 18 Sisters about to turn up tonight for Ky’s birthday!!!! *Don’t worry Kourtney included A post shared by Kim Kardashian West (@kimkardashian) on Aug 9, 2018 at 1:44pm PDT 9 / 18 Image Source: Instagram user khloekardashian 10 / 18 Image Source: Instagram user khloekardashian 11 / 18 Image Source: Instagram user khloekardashian 12 / 18 Image Source: Instagram user kimkardashian 13 / 18 Image Source: Instagram user kimkardashian 14 / 18 Image Source: Instagram user kimkardashian 15 / 18 Image Source: Instagram user kimkardashian 16 / 18 Image Source: Instagram user kimkardashian 17 / 18 Image Source: Instagram user kimkardashian 18 / 18 Kylie JennerKendall JennerCelebrity BirthdaysKourtney KardashianKris JennerKhloe KardashianKim Kardashian