1. A rotor blade assembly for a wind turbine, comprising: a rotor blade having exterior surfaces defining a pressure side, a suction side, a leading edge, and a trailing edge extending between a tip and a root, the exterior surfaces forming a continuous aerodynamic profile; and, a noise reducer mounted on an exterior surface of the rotor blade, the noise reducer comprising: a plurality of noise reduction features each comprising a first end spaced from the rotor blade and a second end proximate the rotor blade relative to the first end, and, a plurality of auxiliary noise reduction features, each of the plurality of auxiliary noise reduction features configured on at least one of the plurality of noise reduction features, and wherein at least one of the plurality of auxiliary noise reduction features is configured on one of the plurality of noise reduction features between the first end and the second end.