The Balmain Army came together Friday night to celebrate a VIP 30th birthday.
The Kardashian-Jenner crew -- including Kim, Kourtney, Kris, Kendall and Kylie -- and the Smith family (minus Will), were among the big names celebrating Balmain creative director Olivier Rousteing's birthday.
A-listers like Jennifer Lopez, Kate Hudson, and Cara Delevingne, as well as Justin Timberlake and wife Jessica Biel, were just a few of the partygoers celebrating at a private residence in Los Angeles' Hollywood Hills on Friday.
Longtime, outspoken Balmain fan Kim shared plenty of photos from inside the soiree. The pregnant reality star's "squad" for the night included her mom and sisters, Jada Pinkett-Smith and her kids, Willow and Jaden, and Mary J. Blige.
The Kardashians weren't the only ones enjoying themselves at the fête. Justin and Jessica have been making more public appearances lately after taking a hiatus from the spotlight following the birth of their 6-month-old son, Silas, and the new parents looked radiant as they helped Olivier belatedly ring in the big 3-0.
JLo looked equally as glowing as she stood by boyfriend Casper Smart's side during the shindig.
Check out even more fun pictures from the party below.