A vanity mirror assembly for a vehicle sun visor includes a cover assembly configured to be slideably supported within a frame and to cover a reflective element while in a closed position and to at least partially expose the reflective element to a vehicle interior while in an open position. The cover assembly includes a substantially rigid body portion, one or more flexible arms extending from the substantially rigid body, and a biasing member configured to drive the one or more flexible arms away from the substantially rigid body and into a corresponding groove of the frame.