Guest List: T.I.

Once he proved his superstar credentials with 2003's Trap Muzik album, T.I. set about making power moves with A-list collaborators. Drake, Diddy and 2 Chainz know who to call when looking to add lyrical swagger to a track. Over in the R&B world, lotharios like R Kelly, Chris Brown and Trey Songz know that Tip's voice is guaranteed to appeal to the ladies.