VIDEO : Taraji P. Henson and Terrence Howard Have Lip Sync Battle

?Empire? stars Taraji P. Henson and Terrence Howard have already shared the mic on their breakout Fox drama, but their musical history actually extends a lot further ? all the way back to 2005?s ?Hustle & Flow,? in which the duo co-starred as love interests and performed the film?s Oscar-winning song, ?It?s Hard Out Here for a Pimp.