Rihanna's lawyer has confirmed she has been subpoenaed to testify at her ex-boyfriend Chris Brown's assault case. Donald Etra told reporters yesterday that the court papers had arrived on Tuesday. She has been told to report to court to testify on 22 Jun, at the previously reported prelim hearing that Brown's lawyers failed to get postponed. As also previously reported, Etra had previously said Rihanna was willing to testify in Brown's case if asked to do so. Brown, of course, is accused of beating Rihanna after the then couple fell out following a pre-Grammy party.