An interior rearview mirror system suitable for use in the interior cabin of a vehicle is provided that includes an interior rearview mirror assembly having an interior rearview mirror support adapted for attaching to a windshield or header portion of the vehicle. The interior rearview mirror assembly includes an interior rearview mirror casing and an interior rearview mirror reflective element. The interior rearview mirror casing is pivotally adjustable about the interior rearview mirror support whereby adjustment of said mirror casing by a driver of the vehicle adjusts the rearward field of view of the interior rearview mirror reflective element in order for the driver to see rearwardly when driving. A pendent accessory comprising a mirror reflector attaches to the interior rearview mirror casing by a pivot joint comprising a ball and socket mount, and the pendent accessory is adjustable by the driver of the vehicle about the pivot joint in order for the driver, when driving, to view a rear seat passenger via the mirror reflector of the pendent accessory when the interior rearview mirror assembly is attached to the interior portion of the vehicle.