Rihanna: the opening/chorus
Kid Cudi: Getting miiine, baby, gotta let these niggas know, etc
Alicia Keys: Whoa-oh-oh-oh-oh
Elton John: I tried to tell ya but all I could say was OH
Fergie: credit card declined, did I not mention I was about to lose my mind, etc.
John Legend: Turn up the lights in here baby, etc