Guest List: Enrique Iglesias

Enrique Iglesias' smooth vocals and endless charisma make his duets with fellow pop icons irresistible. On “Dirty Dancer,” he turns up the heat while matching Usher's star power; on the roof-raising “I Like It,” he parties with Pitbull; and on the glittering “Heartbeat,” he falls into love's embrace with Nicole Scherzinger.