Last night, Keri Hilson appeared on the Late Night Show with David Letterman. She performed her hot single "Knock You Down" featuring Kanye West. Unfortunately, Ne-Yo wasn't there. I think she did a good job. She's a good performer and not only is her voice is good, but her voice is good LIVE! The dancers & dance moves were on point. Kanye popped outta nowhere, and popped Keri on the booty outta nowhere. [Itches cheek] OK guys! LOL. The only thing that was throwing me off was Keri's hair. It was gross, reminded me of D. Woods, but she's gorgeous so I got over it quickly. Check out her performance.