Under the Gunn (also known as "Project Runway: Under the Gunn") is an American reality competition series that premiered January 16, 2014, on Lifetime.
 Production of the series began in November 2013, with the finale filmed on December 17, 2013.
 The series was filmed at the Fashion Institute of Design and Merchandising in Los Angeles.
 Guest judges included: Heidi Klum, Neil Patrick Harris, Macklemore, Jaimie Alexander, Zoey Deutch, Zendaya, Georgina Chapman, Sarah Hyland, Trina Turk, and Wendy Partridge.
Project Runway: Junior is an American reality television series that premiered on November 12, 2015 on Lifetime.
 It is the eighth direct spin-off series of another series, "Project Runway", which airs on the same network.
 It featured twelve teen designers aged between 13 and 17.
 The designers were described by Tim Gunn as "kids [who] have grown up watching this show" ("Project Runway").
Project Runway All Stars (Season 5) is the fifth season of the "Project Runway" spin-off series "Project Runway All Stars".
 It features 13 designers from previous seasons of the original series and Project Runway: Under the Gunn with Alyssa Milano returning as both host and judge.
 TV fashion correspondent and Marie Claire’s Senior Fashion Editor Zanna Roberts Rassi also returns to mentor contestants.
Models of the Runway was a television series on the Lifetime network.
 It was an offshoot of "Project Runway" appearing each week during seasons when "Project Runway" aired, generally immediately following the broadcast of the latest episode, and following the experiences of the fashion models on "Project Runway", focusing on their social interactions and weekly eliminations.
 It ran for two seasons and like "Project Runway" it was hosted by Heidi Klum.
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.
 He has collaborated with producer Ryan Lewis as Macklemore & Ryan Lewis.
 Since 2000, he has independently released one mixtape, three EPs, and four albums.
Project Runway: Junior (season 2) is an American reality television series that premiered on December 22, 2016 on Lifetime.
 It is the eighth direct spin-off series of another series, "Project Runway", which airs on the same network.
 It featured twelve teen designers aged between 13 and 17.
 The designers were described by Tim Gunn as "kids [who] have grown up watching this show" ("Project Runway").
Project Runway All Stars is a spin-off of "Project Runway", featuring returning designers competing for grand prizes.
 Angela Lindvall and Carolyn Murphy have each hosted one season before Alyssa Milano became the staple host of the past three seasons.
 As on "Project Runway", the designers are judged by the host, two permanent judges and guest judges throughout the season.
 The permanent "All Stars" judges have been designers Georgina Chapman and Isaac Mizrahi.
 Joanna Coles mentored the designers throughout seasons one and two, until Zanna Roberts Rassi replaced her through the past three seasons.
Timothy MacKenzie Gunn (born July 29, 1953) is an American fashion consultant, television personality, actor and author.
 He served on the faculty of Parsons The New School for Design from 1982 to 2007 and was chair of fashion design at the school from August 2000 to March 2007, after which he joined Liz Claiborne as its chief creative officer.
 Over 15 seasons Gunn has become well known as the on-air mentor to designers on the reality television program "Project Runway".
 Gunn's popularity on "Project Runway" led to two spin-off shows, Bravo's "Tim Gunn's Guide to Style" and Lifetime's "Under the Gunn", as well as five books.
 In addition to being an executive producer, Gunn has served as mentor for the teen designers on "".
 He also provides the voice of Baileywick, the castle steward in the Disney Junior television show "Sofia the First" and narrated the sitcom "Mixology".
Project Runway Season 8 is the eighth season of the television show "Project Runway".
 The season began airing on July 29, 2010, on the Lifetime.
 After Lifetime cancelled the accompanying series "Models of the Runway", "Project Runway" episodes were extended to 90 minutes in Season 8.
 This was the first season that episodes were longer than an hour with commercials.
Project Runway All Stars (Season 4) is the fourth season of the "Project Runway" spin-off series "Project Runway All Stars".
 It features 14 designers from previous seasons of the original series with Alyssa Milano returning as both host and judge.
 TV fashion correspondent and Marie Claire’s Senior Fashion Editor Zanna Roberts Rassi returns to mentor contestants.

Question: What American rapper was a guest judge for "Project Runway:  Under the Gunn"?
Answer: Macklemore