Kylie Jenner and Tyga celebrated his son King's fourth birthday in style on Sunday.

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The 19-year-old "Keeping Up with the Kardashians" star and 26-year-old rapper treated King Cairo, Tyga's son with ex-fiancee Blac Chyna, to an epic, Ferrari-themed party at Jenner's home.

Several of Jenner's family members, including dad Caitlyn Jenner, mom Kris Jenner, sister Kendall Jenner and niece North West, attended the fete.

The lavish bash featured a mini racetrack and Ferris wheel, inflatable slide and plenty of red and yellow decorations.

Jenner and Tyga shared a number of posts on social media, including a family photo of themselves with King.

Tyga also posted a one-on-one shot with his son with King's toy Ferrari in the background.

"The swaggiest littlest man doing it!!! Happy 4th bday to the young legend!!!" the rapper captioned the picture.

Jenner had shared a rare photo with King while spending time with Tyga and his son last week.

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She recently said in a Snapchat Q&A that she hopes to have children of her own someday.

"I'm getting a lot of questions about kids -- how many kids do I want, do I want kids. I do want kids, but not now," she told her followers.

Jenner and Tyga are longtime friends who went public with their relationship at the reality star's 18th birthday party in August 2015. Jenner's half-brother

Rob Kardashian is engaged to and expecting a daughter with Blac Chyna.