Pop star Britney Spears is getting rewarded for her good behavior.  She's been granted longer visits with her two kids after a child-custody hearing in Los Angeles Tuesday.  She showed up to court somber wearing a polka-dot dress and a white sweater.  Her ex, Kevin Federline, showed up 15 minutes later in a beige pinstriped suit.  Federline's attorney says the longer visits are recognition of the progress she's made.  Federline has custody of the couple's two boys.  Another hearing is set for July 15 to report on the progress from the new arrangement.