"Number One" is the first single featuring Keri Hilson from American R&B singer R. Kelly's 2009 album, Untitled.

In the video, Kelly and Hilson wear Michael Jackson-inspired jackets and pay tribute to the late King of Pop in the Chris Robinson-directed clip.

The official remix features R&B singers T-Pain and Keyshia Cole.

The final version was released two days later, October 1, 2009, with ad-libs by Keyshia Cole on the chorus after her verse.

Holiday's 2007 hit, "Bed" The digital download single of the remix was released on October 27, 2009.