Chris Brown arrived at a L.A. court Wednesday. . . with on-again girlfriend Rihanna on his arm. It seemed like a deliberate signal thrown in the face of prosecutors, who are casting doubt on whether the singer actually completed community service ordered after his 2009 assault of Rihanna. The judge asked for additional documents and scheduled another hearing for April. Prosecutors also raised questions about his recent parking-lot brawl with singer Frank Ocean and other incidents they said demonstrate anger-management issues. The AP reports that Rihanna blew him a kiss as he entered the courtroom and that they left together.