Omari "Omarion" Grandberry was an R&B singer, dancer and actor who first achieved success as a teenager, in the early '00s. He was not Usher, the popular R&B singer, dancer and actor who first achieved success as a teenager in the '90s. Nor was he Marques Houston, the popular R&B singer, dancer and actor who first achieved success as a teenager with the earlier R&B boy band Immature/IMx (though they somewhat confusingly danced together to overcome the bad-guy dancers in You Got Served). He definitely wasn't R. Kelly, the popular R&B singer and actor who never really had a reputation for being a great dancer, in spite of his steps in the "Step In The Name Of Love" video. But the two shared a similar goatee-cornrow combination at times. And he definitely wasn't Omar. Or the other Omar.
Grandberry was the one who came to prominence in the early '00s as a member of the R&B boy-band B2K. After the group dissolved in the mid-'00s he began a solo singing career. In 2005 he released his debut, O, which topped the Billboard charts on the strength of the hit single "Touch." His second album, 21, was released in 2006. In 2007 he collaborated with rapper and peer Bow Wow (formerly Lil' Bow Wow, the rapper and actor who first achieved success as a teenager in the early '00s) on an album called Face Off. He released his third album, Ollusion, in 2010. That same year, he became a judge on the television dance competition America's Best Dance Crew.
In summary, Omarion was the R&B singer, dancer and actor who first achieved success as a teenager in the early '00s and later became a judge on a televised talent show. ~Dan Nishimoto