MMG singer Omarion was sent to the slammer Friday after being stopped in by cops in Cali. Law enforcement sources tell TMZ … the singer was tooling around the San Fernando Valley late Friday morning when he was stopped for running a stop sign. The officer ran his license and found there was a warrant out for his arrest … for failing to appear in court on an earlier traffic ticket. The singer was cuffed and taken to jail. O's bail was set at $20k and has recently been released. Omarion took to twitter to give his fans advise and details of his arrest.