Behind Closed Doors: Chris Brown Infiltrates T.I. And Rihanna's Private Set

The King of the South played The King of Rock during VMA rehearsals this afternoon. During a break in practice, T.I killed time by playing a little air guitar on set. Keeping things light, the rapper sorted out some sound problems while waiting for Rihanna to rehearse their VMA performance of "Live Your Life."

But before the rapper could really get things started, Rihanna strolled in with Chris Brown. After getting a hug from his collaborator, T.I. asked Chris if he's ready for Monday: the morning after the VMAs, the two begin production on the heist caper film, Bone Deep.

With T.I. and Rihanna's rehearsals underway, Chris took a seat to watch... but not for long. "Chris Brown, don't you wanna be in the mosh pit?" the stage director called out over the microphone.

She needed some stand-ins for the audience, so Chris waved his arms in the air, pretending to be a frantic fan. It didn't take much to get Chris Brown to make some moves -- a little while later, he made his way to the front of the stage and started dancing.

We can't reveal much more of what happened at Ri's top-secret rehearsal, but check out photos of Rihanna's dancers getting into their supernatural hair and make-up.

Stay up-to-date on everything about the 2008 MTV Video Music Awards at, and don't miss the big show Sunday (September 7) at 9 p.m. ET/PT or the pre-show red carpet coverage that starts at 8 p.m. ET/PT.