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The Kardashians know how to throw a party. Kourtney Kardashian is celebrating her first child's ninth birthday, and his party was insane! Mason Disick, who was born in 2009, turned 9 on Friday, December 14, so the family celebrated with an epic Fortnite-themed bash on Saturday, December 15. 

The Keeping Up With the Kardashians star hired party planner Mindy Weiss for her son's birthday--and the whole event turned out amazing. His name was spelled out in huge letters, there were gigantic TV screens all throughout the backyard with his favorite video game, while desserts and piñatas were found all over the house. Kid DJ Livia was in charge of the tunes for the celebration and she had all the kids and the famous family out on the dance floor. 

More from MamásLatinas: All about North West & Penelope Disick's epic unicorn-themed birthday party

The famous family was there to celebrate their first nephew's big day. Khloé Kardashian was in attendance with her baby, True Thompson, as well as Kylie Jenner and her daughter, Stormi. Kendall Jenner was there, and of course, grandma Kris Jenner made an appearance looking better than ever in a fancy Burberry outfit. Mason shares a birthday with his 4-year-old brother Reign, but the little one already had a Tarzan-themed joint birthday party earlier this month with cousin Saint West. Mason's dad, Scott Disick, wasn't at the party since he's on vacation in Saudi Arabia with girlfriend Sofia Richie, but Kourt's rumored fling Luka Sabbat was there and having a blast with the birthday boy.

The Kardashians know just how to make their babies feel special and they spare no expense when it comes to celebrating their birthdays. Check out some of the coolest pics from Mason's 9th birthday party--and maybe you'll be inspired if you also happen to have a child who is obsessed with Fortnite.

Luka Sabbat was in attendance for Mase's party. 1

The Grown-ish star, who was rumored to be dating Kourtney, was at the party and went to town on the piñata with Mason. 

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Like every Kardashian kid, Mason got a custom-made Fortnite cake. 2

Some of these cakes the Kardashian kids get almost look too pretty to eat. 

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There were, of course, other themed treats aside from the cake. 3

There were cake pops, cookies and mini ice cream cones decorating the dessert table. If it's one thing they do well, it's throw a party.

DJ Livia was back on the ones and twos for Mason's party. 4

The young DJ was back providing the tunes for the party after she was also hired for North West and Penelope Disick's joint birthday bash in June. It looks like the Kardashians are a fan of her work!

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Of course she had to pose for a pic with Kanye. 5

Uncle Ye was in attendance to celebrate his nephew's birthday, so of course, the DJ had to strike a pose and take a pic with the rapper. "Chicago’s very own," she captioned the snap.

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There were huge TV screens all throughout the backyard. 6

To go along with the them, there were even TVs and comfy chairs set up for the kids to play the video game during the party.

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But no need to worry, the kids still got out on the dance floor. 7

Thanks to the talented DJ Livia, the boys left their video games aside and hit the dance floor to show off their cool moves. It's great to see kids step away from technology and let loose a little bit.

The entire backyard was transformed into a birthday wonderland. 8

The chic outdoor area of Kourtney's house was transformed into a Fortnite wonderland--but even the adults had areas to enjoy!

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Kourtney sang "Happy Birthday" to her little boy. 9

He was surrounded by his friends as his mom and the rest of his family wished him a happy birthday. Look at that custom-made hat!

His little brother and birthday twin also blew out the candles. 10

The boys were both born on December 14, just five years apart, so Kourt let little Reign help his big brother blow out the candles. So cute!

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Reign was living it up during the party. 11

Reign might've already had his own Tarzan-themed birthday celebration a few weeks ago, but he also had himself a good time at his big brother's party. Two parties are better than one!

Mason's aunties were also in attendance. 12

Khloé Kardashian, Kylie and Kendall Jenner were all the party and having some fun on the dance floor. Khloé brought her little baby, True, and Kylie brought daughter Stormi, who was in her aunt Kendall's arms.

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Mason's West cousins were also at the party. 13

While they didn't appear in many of the other videos, his cousin North West was standing right behind him while he was getting ready to blow the candles. Diddy's adorable twin daughters, Jessie James Combs and D'Lila Star Combs, were also there. 

Baby True was ready to party. 14

Little True was all smiles and dressed in all pink for her cousin's big party. 

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Kourt showed off her mom's look on Instagram. 15

Kris is no average grandmother. She showed up to the kid's party wearing a Burberry jacket and matching beret, like the true boss she is.

Even the entrance of the house was decorated. 16

Khloé shared a video of the entrance of the house and a path was lined with horse piñatas from the video game. Attention to detail is key.