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Vin Diesel

1-Man Dance Party

... To Katy Perry Jam

1/28/2014 7:54 AM PST BY TMZ STAFF

012814_vin_diesel_launchVin Diesel felt the urge to dance ... by  himself ... to a Katy Perry song ... and thankfully, he recorded the entire session on video to share with the world.

Diesel took a break in the middle of rockin' out to explain why he felt like dancing -- "Universal just called me and told me "Riddick" is number one on the DVD charts."

Vin says he's especially stoked because it was such a challenge to get the movie made in the first place -- so to celebrate, he cranked some KP (and later Beyonce) and let himself go.

Fierce.

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