Rob Kardashian kicked off his 29th birthday celebration in stepdad mode -- hanging with Blac Chyna and her son, King Cairo.
The trio was all over LEGOLAND on Wednesday, looking like a happy family and having a blast. Rob even wore something besides a black tee for the first time since he's returned to the spotlight.
He's knocking the door on 30 today, but Rob's still a kid at heart. Theme parks'll do that to you.
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