"Knock You Down," which features kanye West and Ne-Yo on wax, is finally providing Keri Hilson with her own solo hit, and she performed it yesterday on Alexa Chung. But unlike her performance of the track on Letterman a while back, Kanye (nor Ne-Yo) show up to help her do the song. Also you might notice that the video fast forwards a bit, and I can't tell if it was technical difficulties live, or if whoever made the video messed up.

Keri Hilson's In a Perfect World is out now.