LOS ANGELES (AP) — Rihanna appeared for the first time at the trial of her longtime partner A$AP Rocky, on the day of its most important testimony — the description by a former friend of the moment Rocky allegedly fired a gun at him.

To fans' surprise, Rihanna made a rare public appearance at the rapper's LA court hearing for his alleged shooting trial.

A$AP Rocky's accuser, former friend and the key witness at his trial is set to take the stand Tuesday afternoon. Rocky, the rapper and partner of Rihanna, has pleaded not guilty to two felony counts of assault with a semiautomatic firearm for allegedly firing at the friend who goes by A$AP Relli.