Video: Keri Hilson w/Kanye West - "Knock You Down" on Letterman 5/4/09 (TheAudioPerv.com)

Keri Hilson, looking a bit like a biker chick, performs on stage with KanYe West her new hit single Knock You Down. You really think Letterman was that impressed? yeahzah

I can confidently say that this is the first time I have listened to a song by Keri Hilson. Kanye's verse is pretty nice (he is guesting on EVERYONE'S track this year), and his casual booty smack of Keri at around the 3:16 mark provides for some lighthearted entertainment, I guess. You can find the mp3 download, courtesy of Culture Bully , at the bottom of the post. Keri Hilson: "Knock You Down ft. Kanye West (Live on Letterman)" (Audio Download)

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Keri Hilson keeps some impressive company. Her debut album, In a Perfect World..., features contributions from Lil Wayne, Timbaland, Justin Timberlake and Ne-Yo, and she was joined by Kanye West for this performance of "Knock You Down" on Letterman last night (May 4). There's some amusing interplay between West, Hilson, and her dancers as he briefly takes the stage, causing Letterman to say he feels "so old" as he greets them all at the end of the song. In a Perfect World... is out now on Interscope Records.

Keri Wilson and Kanye West perform "Knock You Down" on the May 4 episode of the Late Show.

• Keri Hilson - Knock You Down (Feat. Kanye West on the Late Show with David Letterman 05-04-2009)