Watch Vin Diesel Lip Sync To Katy Perry’s ‘Dark Horse’ [Video]

Vin Diesel, action hero, director, Karaoke diva? The star of "XXX," "Fast & Furious," and "The Chronicles of Riddick" shared a video on his Facebook page. What was the macho man doing? He was lip syncing to Katy Perry's Dark Horse." I felt compelled to share it with you...