Kourtney Kardashian, Scott Disick Throw Son Mason's Bar Mitzvah Party at West Hollywood Nightclub

Mason Disick celebrated a special birthday surrounded by his whole family.

On Saturday, the 13-year-old son of Kourtney Kardashian Barker and Scott Disick had a private Bar Mitzvah ceremony, followed by a private dinner and a reception with family and friends at offsunset, a Sunset Strip nightclub in West Hollywood, a source tells PEOPLE.

The source adds that the religious milestone was important to Scott, who was raised Jewish by his late parents, Jeff and Bonnie Disick.

At the afterparty, Mason and his friends had fun on the dance floor, decorated in silver balloons with a Chrome Hearts-inspired logo customized for Mason with the Star of David and the date serving as the backdrop.

Aside from Kourtney and Scott — whose younger children Reign, 8, and Penelope, 10, were also in attendance — Kim Kardashian arrived with her older two kids, Saint, 7, and North, 9.

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Though Travis Barker did not attend, his stepdaughter Atiana De La Hoya joined in on the festivities as well as Kourtney's sisters Kendall and Kylie Jenner and Khloé Kardashian.

At one point during the party, Mason's little brother Reign — with whom he shares a birthday — was lifted on a chair in the midst of the crowd.

The Good American founder shared a few shots from the event on Instagram Saturday, posing with Penelope and North as they made silly faces for the photos.

"Mazel Tov Mason!!! The girls and I attempted to take some pics," Khloé captioned the carousel of images.

On Wednesday, Kim posted a tribute to her teenage nephew on his birthday.

"The day has come where you're taller then me now," the proud aunt wrote. "I just love who you are and I'm just so proud of you Mason. Welcome to your teenage years 🤍 Happy birthday."

The celebratory post came shortly after mom Kourtney called the date "one of the best days" of her life in a sweet caption dedicated to her sons' birthdays.

"December 14th… one of the best days of my life, twice and forever. my birthday boys," the mom-of-three wrote on Instagram alongside a throwback photo of the pair.