MC Hammer's kid is dressing up as Urkel for Halloween (NO OFFENSE TO THE MAN BUT TURN OFF YOUR SOUND BEFORE YOU CLICK THAT LINK). I know this because I subscribe to Hammer's RSS feed because I like to keep up with how Hammer is doing. What.
The kid looks to be about ten so the only way this happened is if Hammer has the entire run of Family Matters on DVD. This is what I like to think.