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Only a real man's man like Mark Wahlberg can pull off riding such a tiny bike on the streets of Los Angeles -- and still look totally cool while doing it!

We caught up with The Fighter star as he taught his son Michael, 5, how to ride the tiny motorbike at a basketball court near the actor's LA-area home, on Monday.

Wahlberg must have forgotten his helmet at the house, but thankfully the actor made sure his adorable son's headgear was strapped-on tight before letting him take a ride.

What a great dad!