Kylie Jenner threw her boyfriend Tyga a surprise birthday party Thursday and made sure to include the rapper's son, King Cairo.

The 19-year-old "Keeping Up with the Kardashians" star enlisted the 4-year-old to help her surprise Tyga with an early 27th birthday celebration at her home in Hidden Hills, Calif.

Jenner decorated her house with balloons and provided two birthday cakes for her beau. She shared a number of posts from the party on social media, including a video of Tyga arriving at the bash.

"Happy early birthday @kinggoldchains," she captioned the clip on Instagram.

Jenner and Tyga later jetted off on the rapper's birthday getaway. The couple are longtime friends who went public with their relationship at Jenner's 18th birthday party in August 2015.

"The first year we started hanging out, everyone around him told him not to be with me. I still get comments like, 'Don't be with him.' But we're not doing it for the public -- we love each other," she said in the Oct/Nov issue of Complex.

"We need to be together at all times," she admitted. "We never get mad at each other, we just figure things out."

Jenner showed off her enormous promise ring and a new diamond necklace from Tyga on Snapchat earlier this month.

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Tyga shares King with his ex-fiancee, Blac Chyna, who welcomed a daughter, Dream Renee, with Jenner's half-brother Rob Kardashian on Nov. 10.