October 17, 2016 09:06 AM

King Cairo rang in his 4th birthday with not just one but two Ferrari-themed parties — and one very special message from his stepfather-to-be Rob Kardashian.

Kardashian, 29, took to Instagram Sunday to wish his fiancée Blac Chyna‘s son a happy birthday.

“HAPPY BIRTHDAY KING!!” he captioned an adorable picture of the two playing on a slide together. “THANK YOU for letting me see what a great mama you got! That was the first thing I fell in love with… The way she loves FOR you is something I can’t wait for!”

Kardashian, who is expecting a daughter with Chyna next month, added that he was looking forward to fatherhood.

“Can’t wait for the bond I’m going to have with my daughter so thank you King for allowing me to see that,” he wrote. “Everybody loves you! HAPPY BIRTHDAY WOOHOOOOO TURN UP! GO DODGERS!”

King is Chyna’s son with her ex-fiancé Tyga, who is currently dating Kardashian’s sister Kylie Jenner.

On Saturday, Chyna, 28, threw her son an extravagant “Lego Ferrari Party,” complete with a giant inflatable race car slide, lemonade stand, taco grill and Lego building stations. Chyna’s mother Tokyo Toni and future mother-in-law Kris Jenner were also in attendance.

On Sunday, Tyga, 26, threw King another Ferrari-themed party. Jenner, 19, was in attendance and documented much of the bash on Snapchat. Sisters Kourtney Kardashian and Kendall Jenner also joined in on the festivities.

Keeping Up with the Kardashians returns Sunday at 9 p.m. ET on E!

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