Question: On the  American reality competition Under the Gunn, singer Zendaya appear as a guest judge with what other single name singer?

Context articles: Skating with the Stars
Dance Your Ass Off
Under the Gunn
Top Chef Duels
RuPaul's Drag Race
Zendaya
Swag It Out
Cake Wars
Zendaya (album)
Let It Shine (2017 TV series)

Skating with the Stars is an American reality competition that aired on ABC from November 22, to December 21, 2010.
 "Skating with the Stars" features celebrities paired with professionals from the world of figure skating.
 It was the second figure-skating based reality competition after "Skating with Celebrities" which aired on Fox in 2006.
Dance Your Ass Off (also rendered in a censored form as Dance Your A** Off for broadcast television mentions and promotions) is a reality competition series on the Oxygen Network hosted by Marissa Jaret Winokur in the first season, then Melanie Brown in season two.
 Similar to the set up of "Dancing with the Stars" competitors are paired with a professional dancers in hope of impressing judges and the viewing audience.
 However, each of the twelve contestants are also hoping to lose weight during the process.
 It premiered on June 29, 2009.
 The medical doctor is Rob Huizenga from "The Biggest Loser".
 The season premiere brought in 4.3 million viewers making it the most watched show in history of Oxygen Network.
 In the judges panel are Danny Teeson, a lifestyle coach and dancing expert, actress Lisa Ann Walter, and professional dancer Mayte Garcia, who only appeared as a guest judge for a week in season 2.
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.
Top Chef Duels is an American reality competition series which premiered on August 6, 2014, on Bravo.
 The culinary show is one of the several spin-off series of the popular cooking competition show "Top Chef" aired on the same network.
 Announced in January 2014 as "Top Chef Extreme", the series features eighteen contestants who have previously competed in "Top Chef" and "Top Chef Masters".
 During each episode, two of the contestants face each other in various culinary tasks.
 The winner is picked at the end of an episode to compete in the championship finale.
 The series is hosted by Curtis Stone.
 Besides hosting, Stone is also a judge together with Gail Simmons, while Wolfgang Puck, Hugh Acheson and other celebrity guest judges make numerous appearances throughout the series.
RuPaul's Drag Race is an American reality competition television series produced by World of Wonder for Logo TV and, beginning with the ninth season, VH1.
 The show documents RuPaul in the search for "America's next drag superstar."
 RuPaul plays the role of host, mentor, and head judge for this series, as contestants are given different challenges each week.
 "RuPaul's Drag Race" employs a panel of judges, including RuPaul, Michelle Visage, Ross Mathews, Carson Kressley, and a host of other guest judges, who critique contestants' progress throughout the competition.
 The title of the show is a play on drag queen and drag racing, and the title sequence and song "Drag Race" both have a drag-racing theme.
Zendaya's music career began in 2011 when she released the single "Swag It Out", followed by the single "Watch Me" (with Bella Thorne); the former was released by an independent record label.
 She signed a major record deal with Hollywood Records on August 8, 2012, and started recording songs for her debut album on August 12, 2012.
 The album, titled "Zendaya", was released on September 17, 2013, preceded by the single "Replay".
"Swag It Out" is the official debut single by American singer Zendaya, known for starring in the series "Shake It Up".
 The song was composed by Bobby Brackins and was released on May 30, 2011 as the first single of Zendaya's career on an independent label, not being included on any album or soundtrack of Walt Disney Records, just their record label.
Cake Wars is an American reality competition series which was first broadcast on June 29, 2015 and aired on the cable TV channel Food Network.
 "Cake Wars" is a spinoff of Food Network's popular baking reality series "Cupcake Wars".
 Jonathan Bennett hosts a competition where four bakers face off to have their cakes featured in a special event, in addition to a $10,000 prize.
 Star pastry chefs Waylynn Lucas, Ron Ben-Israel and Richard Ruskell judge which cakes are worthy of headlining parties for things such as "The Simpsons", "The Sound of Music", DC Comics, and more.
 The first season of the show ran for 8 episodes and later seasons of the show, Season 2 and so on run for 13 episodes.
 There was also an annual Christmas-themed spin-off of the show called "Cake Wars: Christmas" which made its debut the same year as "Cake Wars" and is identical and similar to another annual holiday-themed show called "Halloween Wars" which is for Halloween instead of Christmas.
Zendaya is the eponymous debut studio album by American actress and singer Zendaya, released on September 17, 2013 by Hollywood Records.
Let It Shine is a British reality television music competition to find young men to star in "The Band", a new stage musical featuring the songs of Take That.
 It aired in January and February 2017 on BBC One.
 The show is presented by Graham Norton and Mel Giedroyc, with Gary Barlow, Dannii Minogue and Martin Kemp serving as judges throughout the series.
 Amber Riley was the guest judge for the auditions, followed by Lulu for the group round.
 Ricki Lake was the guest judge for the first live show, Ashley Roberts for the semi-final and Peter Kay for the final.