Kardashian Clan Gets Seriously Sexy for Kylie Jenner's 18th Birthday Bash—See Every Outfit From Her Big Weekend!

Kardashian-Jenner clan gets all dressed up for Kylie's 18th birthday

We anticipated that Kylie Jenner's 18th birthday would be a sartorial event and—you guessed it!—the Kardashian-Jenner clan did not disappoint.

Kylie's closest family and friends stepped out in style to West Hollywood nightclub Bootsy Bellows for a massive, invite-only party that saw performances by Tyga, Fetty Wap and an end-of-the-night white Ferrari surprise. While we don't know if Kylie had specific attire requirements for her blowout bash, the theme seemed to be black, sheer and ultra-sexy.

To kick the festivities off, the birthday babe slipped into a skintight, iridescent Nicolas Jebran mini featuring risqué sheer panels all over. She ended the night in an equally glimmering look, sporting a little black dress with the same nude ankle-strap Gianvito Rossi sandals she wore with outfit number one.

Hot mama-of-two to be Kim Kardashian took to Kylie's birthday dinner at The Nice Guy in Los Angeles wearing a clingy black midi that, well, left little at the top to the imagination. Kendall Jenner, meanwhile, let her abs do the talking in a slim white House of CB crop top and (very) high-slit LaQuan Smith skirt.

Kourtney Kardashian and Khloé Kardashian used this occasion to show off their bangin' bods (those workouts are for real, for real paying off), with Kourt sporting a tummy-baring LaQuan Smith jumpsuit and Khloé donning an itty black Balmain mini with sheer horizontal panels. (Talk about strategic placement.)

Kylie's parents Caitlyn Jenner and Kris Jenner were also on hand to fête their youngest daughter: Caitlyn in her go-to LBD and gladiator sandals look and Kris in a sexy bustier, sheer trench and leggings.

Jenner's birthday weekend was just that—a three-day marathon event that also saw the Kardashian sisters getting dolled up for, well, reasons that have yet to be revealed! Kim and Kourtney took to Instagram on Aug. 9 with matching shots of themselves decked in plunging black get-ups—and both sisters rocked Betty Page-style bangs. (It also appears that Kim is back to wearing her designer-fave Atsuko Kudo, the mastermind behind her sexiest latex looks.)

Back to the birthday gal! The festivities began Friday, with Kylie stepping out to a family dinner at Nobu Malibu in an all-white jumpsuit and ankle-strap heels. Khloé stayed close behind her sister in a clingy dress, gunmetal Haider Ackermann jacket and silver-print Christian Louboutin heels.

Kourtney continued her breakover chic streak in high-waist orange trousers from ASOS, a rock show-ready leather jacket by Balenciaga and not one but two fringed purses (by Chanel and Saint Laurent).

Kim's bump looked bigger than ever in a dress that fit her style motif for the weekend—meaning a curve-hugging LBD, which she paired with a cropped BLK Denim jacket and sandals from hubby Kanye West's collab with Giuseppe Zanotti.

Caitlyn, Kris and Kendall attended, of course: Kris in a plaid blue ensemble, Caitlyn in a trim black midi and Kendall sporting a gray bodysuit, Goldsign jeans and metallic Tom Ford pumps.