It’s party time!

Tristan Thompson threw an 18th birthday party for his youngest brother, Amari, on Saturday and his ex Khloé Kardashian was in attendance.

According to social media posts shared by the exes on Instagram, the teen enjoyed a nice layout at the Cleveland Cavaliers star’s Hidden Hills, Calif., home.

In the outside pool area were silver balloons that read, “Happy Birthday Amari,” the number 18 and different shades of blue balloons.

There was also light blue silverware in cups and glasses and plates and cups adorned with green, pink, gold and blue stars.

Guests were able to dine on a fruit tray — created by Boujie Boards — that was filled with watermelon, kiwi, grapes, strawberries, blueberries, pineapples and more and a tray that was filled with different candies and cookies.

Amari also had a circle-shaped cake that featured green and white icing and strawberries and blueberries.

Amari, who has epilepsy, posed with Thompson, 33, and Kardashian, 40, in separate snaps. He also posed with Kim Kardashian, Kris Jenner and several of the Kardashian/Jenner kids, including Stormi, 6, True, also 6, North, 11, Saint, 8, Penelope, 12, Tatum, 2, Psalm, 5, and more.

Khloé posted a sweet birthday shoutout to Amari on Instagram along with photos of them over the years.

“Happy 18th Birthday sweet angel Amari!! I can’t believe you are 18! You have changed our lives in the best possible ways!” the Good American co-founder wrote.

“Thank you for being an angel to us all! You are the sweetest, silliest and most loving young man. I hope you feel how much we love and adore you our sweet angel Amari .”

Tristan also showed his younger bro love on his respective page.

“Happy birthday, Amari! Big number 18! We are so blessed and fortunate for all the blessings that you bring to our lives! You are always a beacon of light! I love you so much and I’m so so blessed to be your older brother,” he wrote.

In February, Tristan became the legal guardian over Amari after their mother, Andrea Thompson, died from a heart attack in January 2023.

The NBA champion first filed for temporary guardianship over Amari in September 2023, claiming their father, Trevor Thompson, had played no role in raising the teen since 2014.

Tristan was allowed to manage his brother’s finances — including the $103,475 inheritance he received from his late mother — travel both domestically and internationally with him, decide on living arrangements and more.