Jamie Foxx Does Michael Jackson Dance In His Underwear

The video was shot at an after-party at Jamie's mansion in L.A. ... roughly ten years ago ... right around the time he was blowin' up for his role in "Ali."

Foxx -- sporting nothing but a pair of red briefs, white sneakers and a baseball hat -- gets downright funky in front of a group of friends while Prince's "I Wanna Be Your Lover" plays in the background.