Happy birthday, girl! Kendall Jenner is officially 20 years old as of Tuesday, Nov. 3, but the family came out to The Nice Guy in L.A. on Monday, Nov. 2, to show their full-fledged support for their model sister (and half-sister) — in sheer, high-waisted jumpsuits and tons of sequins, naturally.
PHOTOS: Kendall Jenner's runway looks
Taking a cue from Kylie Jenner's 18th birthday party on Aug. 9, most of the Kardashian-Jenner crew stuck to head-to-toe black, including the birthday girl herself. Kendall left little to the imagination — and showed off her slender figure — in a skintight custom Sergio Hudson jumpsuit with a cutout décolletage, sheer paneling on the sides, and a halter neck. The Estee Lauder brand ambassador paired her look with a black clutch and a matching pair of black heels.
PHOTOS: Kendall Jenner's bikini body
Kourtney Kardashian served up major gothic vibes in a lace-up bustier-like top, a black silk bomber jacket, and skintight leather leggings by Balenciaga. The eldest of the Kardashian sisters, 36, completed her vampy outfit with a pair of lace-up pumps that echoed her top and a heavily fringed bag.
Expecting mother Kim Kardashian dressed up her bump in an all-black, all-sequin turtleneck number with black ankle-strap heels and a power pony, which reminded Us of Kendall's Balmain runway style. Kim's husband, Kanye West, chose a neutral color palette of brown, gray, and taupe in a sweatshirt, tee, shorts, and Yeezy "Boost" sneakers.
PHOTOS: Kim Kardashian's second pregnancy style
Khloe Kardashian, who debuted her "high-fashion lob" a week prior at Kim's baby shower, showed off her fresh new cut again in her all-black ensemble. The Strong Looks Better Naked author, 31, showed off her fit physique in a bodycon bodysuit, which she paired with black Christian Louboutin pumps and a cropped leather jacket.
PHOTOS: Khloe's body transformation
Kylie, yet again proved that she's never one to stick to the mold, turning heads in a bright orange pantsuit with pleated slacks and a draped shirt, which she accessorized with a perfectly matched tangerine belt. Kylie debuted a new hairstyle — textured bangs — at the party, and wore smoky eyes and her signature sepia lip.
PHOTOS: Kylie Jenner's style transformation
The matriarch of the family, Kris Jenner, was also in attendance in a dark getup of a black overcoat, a turtleneck, and velvet leggings. She completed her style with a crossbody bag and flat calf-length boots.
Of course, famous friends of the high-profile clan didn't disappoint sartorially. Kendall's BFF Gigi Hadid wore a plunging, silky white blouse tucked into a pair of high-waisted slacks, while her tattoo buddy, Hailey Baldwin, stuck with the second-skin theme in a tight army green crop top and skirt combo.
Which of the looks was your favorite? Tweet with @UsWeekly using the hashtag #stylebyUs!
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This article originally appeared on Usmagazine.com: Kardashian Family Celebrates Kendall Jenner's Birthday in Skintight Clothing, Sequins, Sheer Outfits: Birthday Pics