pbr Chris Brown has been 'making progress' during his probation for the assault of ex-girlfriend Rihanna, .an L.A. court has heard.br ppbr The Kiss Kiss singer was sentenced to five years probation after the attack, and his lawyer Mark Geragos confirmed that his client has completed the 300 hours of community he was asked to perform.br ppbr He has also attended all but one of his 52 mandatory domestic violence counselling sessions.br ppbr Since the incident before the 2009 Grammy Awards, Brown's celebrity star has dwindled after becoming one of the most successful R&B artists in the US.