What American rapper was a guest judge for "Project Runway:  Under the Gunn"?
Under the Gunn:  Guest judges included: Heidi Klum, Neil Patrick Harris, Macklemore, Jaimie Alexander, Zoey Deutch, Zendaya, Georgina Chapman, Sarah Hyland, Trina Turk, and Wendy Partridge. Macklemore: Benjamin Hammond Haggerty (born June 19, 1983), known by his stage name Macklemore ( ), and formerly Professor Mack Lemore, is an American rapper from Seattle, Washington.
Macklemore