Olivier Rousteing's Epic 30th Birthday Puts All Other Parties to Shame
After a catwalk event so major it finished with a live Backstreet Boys performance, we didn't think life could get any better for designer Olivier Rousteing. But on the heels of last week's Balmain x H&M catwalk, Rousteing was feted by his own #Balmainarmy of models and half of Hollywood's best dressed for an epic 30th birthday party. Appearances from Justin Timberlake, Jessica Biel, Kate Hudson, and, of course, the Kardashian-Jenners, all in Balmain, made this a fashion gathering so huge, we don't think we don't think we've seen a guest list like it since Fashion Week. Scroll on to get a VIP look at one of the biggest — and best-looking — parties we've ever seen.