B2K's Omarion went solo in 2005 with O, featuring production help from the Neptunes, Rodney Jerkins, and the Underdogs. The title track, released as the lead single, helped send the album to the top of the Billboard chart. His second album, 21, followed in late 2006 and was kicked off by the excellent Timbaland collaboration "Ice Box." Also an actor, Omarion appeared in the movie version of Fat Albert, You Got Served, and The Bernie Mac Show. He teamed up with Bow Wow for Face Off, a collaborative album released in December 2007.