Knock You Down - nuovo singolo di Keri Hilson con Kanye West e Ne-Yo

http://www.youtube.com/watch?v=nOAL7qkd97c&eurl=http%3A%2F%2Fwww.soundsblog.it%2Ftips%2Fitem%2Fknock-you-down-nuovo-singolo-di-keri-hilson-con-kanye-west-e-ne-yo&feature=player_embedded