Kylie Jenner

AKM-GSI; FJRNEWZ / Splash News

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.

Kim Kardashian, Khloe Kardashian, Kourtney Kardashian, Kendall Jenner

AKM-GSI; Splash

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 Khloe 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.)

Caitlyn Jenner, Kris Jenner

Photographer Group / Splash News

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.

Kim Kardashian Instagram

Instagram

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.)

Kim Kardashian, Khloe Kardashian, Kylie Jenner

AKM-GSI

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 Kardashian

DOBN RMBI/AKM-GSI

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 Kardashian

AKM-GSI

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.

Kim Kardashian, Kris Jenner, Kendall Jenner, Caitlyn Jenner

AKM-GSI

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.

What's your favorite look from Kylie's big birthday weekend?
PHOTOS: Every time Kylie Jenner has dressed exactly like Kim Kardashian

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