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Prince Jackson Practices Jiu Jitsu Badass At Legendary Fight School (PHOTOS)

LAS VEGAS, NV - JUNE 29:  Prince Jackson arrives at the world premiere of 'Michael Jackson ONE by Cirque du Soleil' at THEhot
LAS VEGAS, NV - JUNE 29: Prince Jackson arrives at the world premiere of 'Michael Jackson ONE by Cirque du Soleil' at THEhotel at Mandalay Bay on June 29, 2013 in Las Vegas, Nevada. (Photo by Steven Lawton/FilmMagic)

Prince Jackson is one step closer to becoming a cold-blooded killing machine -- TMZ has learned, Michael Jackson's first born just earned his blue belt in Jiu Jitsu last week ... from one of the most famous martial arts schools in the world.

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