21 is the second studio album from R&B singer & former B2K frontman Omarion. The 1st single off the album was "Entourage" written by Andre Merritt & produced by Eric Hudson. The 2nd single "Icebox", produced by Timbaland. Other collaborators on the album include Pharrell & songwriter Bryan Michael Cox. The album name "21" was inspired from when Omarion turned 21-years-old months before his album release.
The album landed at #1 in the Billboard 200, selling 119,000 copies in its first week, making it his second album to hit #1, although selling 60,000 less than his first solo album O. It has sold over 390,000 copies in the United States up to November 2008.