Brad Pittand Angelina Jolie‘s son Knox‘s 17th birthday kicked butt — literally — because he spent his big day winning a martial arts competition.
With Angelina and his twin sister Viviennecheering him on from the crowd, Knox won the IKF Point Muay Thai Technical event on his birthday weekend.

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Video from the competition shows Knox beating the crap out of an opponent … landing a bunch of punches and kicks as they battle on a red and blue mat.
Knox took home some hardware … posing for a photo with a medal hanging around his neck. The event went down on the USC campus.
Angelina even snapped a photo with one of Knox’s Muay Thai coaches … and she’s looking like a proud parent.
Brad did not appear to be in attendance … and the event came on the heels of a report claiming he’s desperate to reunite with Knox and Vivienne and make amends.
Knox still has Jolie-Pitt as his last name … unlike some of his siblings, who dropped Pitt from their names amid Brad and Angelina’s messy divorce, which took 8 long years to finalize.
Angelina’s on the record saying she’s escaping Los Angeles as soon as Knox and Vivienne turn 18 … so Brad’s got another year, at least, to try to reunite with Knox.