Attorney Donald Etra confirmed to the magazine that the singer was served with the subpoena in person on Tuesday in Los Angeles.
"Rihanna was served at my office by L.A. DA investigators," Etra said. "If the preliminary hearing indeed goes forward, she is now legally required to be there, she will be there, and will answer all questions truthfully."
Chris Brown lost a bid Wednesday (June 10) to delay that preliminary hearing. His attorney, Mark Geragos, had argued that the hearing should wait for a related California Supreme Court decision.
A judge had previously nixed a bid by Geragos to obtain access to police records that the attorney argued were crucial to the hearing. In his appeal, Geragos said a state Supreme Court case currently under consideration could affect Brown's access to the records.
Legal expert Peter T. Haven told MTV News last month that the preliminary hearing will determine whether there is sufficient evidence for the case to go to trial.
"During the preliminary, which is significant, the prosecution puts the case in front of the judge to convince the judge that they have sufficient evidence to go forward with a criminal prosecution," Haven told MTV News. "The defense then tries to kill the case. [But] if there's enough evidence, the prosecution could then get a trial date."
Haven said once a ruling is made in the preliminary hearing, a trial date would be expected to begin in 30 to 90 days.