Photo: BACKGRID (3); Getty; BACKGRID

Kylie Jenner, Kendall Jenner, Kourtney Kardashian, Khloe Kardashian, Kim Kardashian

When there’s a family fête, the Kardashian-Jenners make sure to dress their best.

This time, sistersKourtney,Kim,Khloé,KendallandKylie, alongside matriarchKris, came together to celebrate Kourtney’s eldest sonMason(whom she shares with exScott Disickand who turned 13 last week) at his Bar Mitzvah party held on Saturday night.

An insider at the gathering tells PEOPLE that the family held a private Bar Mitzvah dinner before heading to the reception and after-party at the offsunset lounge in West Hollywood.

On the fashion front, each of the Kardashian-Jenner ladies adhered to what seemed to be an all-black dress code, each of them wore their go-to looks, from cocktail chic gowns to runway-ready pieces.

Kourtney Kardashian

BACKGRID

West Hollywood, CA - Kourtney Kardashian returns to her ride after celebrating with family at her son Mason Disick’s Bar Mitzvah.

The Poosh mogul (and mom to Mason!) opted for a bohemian business casual look in a flare-legged jumpsuit with a midriff cutout. She teamed the piece with a fun heart-shaped purse.

Dedicatingan Instagram birthday postto Mason, as well as her youngest Reign who shares the same birthday as his brother, Kourtney wrote, “December 14th… one of the best days of my life, twice and forever. my birthday boys.”

Kim Kardashian

Kim Kardashian shows off her famous figure as she exits Mason’s Bar Mitzvah in L.A to attend Ben Affleck and Jennifer Lopez Holiday Party.

“I just love who you are and I’m just so proud of you Mason. Welcome to your teenage years. Happy Birthday,” she captioned an Instagram story of herself and Mason comparing heights as she rang in her nephew’s new year.

Khloé Kardashian

Rachpoot/Bauer-Griffin/GC Images

Khloe Kardashian is seen on December 17, 2022 in Los Angeles, California.

Khloé covered herself from neck-to-toe in a sleek catsuit complete with pant boots and gloves. The Good American founder accessorized with shades, a big cross chain necklace and earrings to match, and a tiny metallic pouch. Ditching herjust-debuted bangs, she sported long wavy honey-blonde locks.

“Mazel Tov Mason!!! The girls and I attempted to take some pics,” she wrote onInstagramwhile sharing photos of her ensemble alongside nieces Penelope Disick, 10, andNorth West, 9.

Kendall Jenner

Kendall Jenner and Kylie Jenner get dressed in black as they attend Mason’s Bar Mitzvah in West Hollywood.

Kylie Jenner

Kylie Jenner Mason Birthday

Kris Jenner

Kris Jenner causes a flash frenzy as she exits her grandson Mason’s Bar Mitzvah to head to JLO’s Holiday party in West Hollywood.

Kris suited up in an all-black set with delicate floral appliqués, dazzling stud earrings, leather gloves and a mini purse.

Celebrating her first grandchild, the momagerwrote on Instagram, “I am so very proud of you each and every day! You’ve grown into such an amazing young man, and I adore you.”

source: people.com