Rob Kardashian Wishes Future Stepson King Cairo a Happy Birthday With a Sweet Tribute!

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Stepfather goals! Rob Kardashian took a moment to honor his stepson on his birthday on Sunday. Posting a pic riding down a giant slide beside the little boy, Blac Chyna’s fiancée penned a sweet message.

WATCH: Kylie Jenner Shares Intimate Photo With Tyga, Celebrates King Cairo's Second Ferrari-Themed Birthday Party

“HAPPY BIRTHDAY KING‼ THANK YOU for letting me see what a great Mama you got!” Rob captioned the cute pic. “That was the first thing I fell in love with,,, The way she Loves FOR You is something I can't wait for!”

Rob added that his friendship with Chyna and Tyga’s son has gotten him excited for his own little one’s impending arrival.

“Can't wait for the bond I'm going to have with my daughter so Thank You King for allowing me to see that! Everybody Loves You! HAPPY BIRTHDAY WOOHOOOOOO TURN UP ! GO DODGERS,” the reality star wrote.

King had a blowout birthday weekend. First he had a Lego and Ferrari-themed bash at his mom’s place before Tyga hosted another Ferrari extravaganza on Sunday.

WATCH: Blac Chyna Celebrates King's 4th Birthday With Epic Lego and Ferrari-Themed Party -- See the Pics!

The little cutie turned 4 and his pregnant mama couldn’t be more excited.

“Happy 4th Birthday to my first born son King Cairo. Over the years you have made me a better version of myself and I will always continue to give u unconditional love and support !!! I love you so much my little Ferrari man,” Chyna captioned a video.

For more from King’s birthday weekend, watch the video below!

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