Question: When did the artist who was a guest judge in Under the Gunn begin her music career?

Context articles: Zendaya
Under the Gunn
Top Chef Suomi
Tuyệt đỉnh tranh tài
Let It Shine (2017 TV series)
The X Factor (UK series 12)
Indonesian Idol (season 6)
MasterChef Vietnam (season 3)
The X Factor (UK series 11)
The X Factor (UK series 8)

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".
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 Suomi is a Finnish cooking reality show on Sub based on the American television series "Top Chef".
 Auditions for the series were held in autumn 2010 and 12 contestants were chosen.
 The programme is hosted by model and restaurant chef Pipsa Hurmerinta The head judge for the competition is Finland's most renowned chef Hans Välimäki.
 The other judge is business group manager of Royal Ravintolat Pia Kämppi.
 "Top Chef" season 5 runner up Stefan Richter has made an appearance as a special guest judge for the first four episodes.
 The show is produced by Solar Television Oy.
 The show is renewed for a second season, which is expected to premiere in either fall 2011 or in spring 2012.
Tuyệt đỉnh tranh tài is a Vietnamese vocal/singing competition between recording artists, airing on HTV7 at 9:00 pm (UTC+7) prime time slot every Saturdays.
 The show premiered on April 19, 2014 with Huỳnh Trấn Thành serving as the host.
 Lê Hoàng is a permanent judge on judging panel, joined by diva Hồng Nhung for the first six weeks of the show and by Ý Lan for the rest of eleven weeks.
 Also, there is the third guest judge spot to fill.
 The winner of the show might take home 400,000,000 VND in cash (roughly $18,800).
 The first season includes 12 episodes.
 Contestants of the show are known artists in different music genres.
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.
The X Factor is a British television music competition to find new singing talent.
 The twelfth series began airing on ITV on 29 August 2015 and ended on 13 December 2015.
 The judges were Simon Cowell, Cheryl Fernandez-Versini, who returned for their respective ninth and fifth series as judges, series 9 guest judge and former "The Voice UK" coach Rita Ora, and BBC Radio 1 DJ Nick Grimshaw, with Grimshaw and Ora replacing Louis Walsh, the only judge who had been on the show from its inception in 2004, and Mel B.
 It was presented by Caroline Flack and Olly Murs, who had both previously co-presented spin-off show "The Xtra Factor" on ITV2 and replaced Dermot O'Leary, who left after eight series.
 Rochelle Humes and Melvin Odoom presented "The Xtra Factor", replacing Sarah-Jane Crawford.
 Louisa Johnson was announced as the winner on 13 December 2015, making Ora the winning mentor.
Indonesian Idol Season Six is a continuation of the Indonesian Idol show in the year 2010.
 Indonesian Idol came back after a suspension in the year 2009.
 What is different in this season is the judge of this event is no longer Titi DJ and Indra, who was replaced by Erwin Gutawa and Agnes Monica.
 Formation of the judge changed to four persons, namely Erwin Gutawa who acts as chairman of the judge, Agnes Monica, Anang Hermansyah, and a guest judge.
 For the position of the host, remains entrusted to Daniel Mananta which will guide the event this year alone.
 This season, Indonesian Idol theme is "Be A Superstar".
MasterChef Vietnam 2015 is the third season of the reality TV show "MasterChef Vietnam".
 The original "MasterChef" program was developed by BHD Company in United Kingdom with Vietnam Television buying copyright and implementation.
 Unlike most series around the world, local celebrities will compete for prize money along with amateur cooks.
 Christine Ha, the first blind and Asian winner for season 3 of US version of Master Chef became the third judge, having been a guest judge in the previous two series and in MasterChef US season 4 and MasterChef US season 6.
 She is the first former contestant and winner worldwide to become a judge.
The X Factor is a British television music competition to find new singing talent.
 The eleventh series began airing on ITV on 30 August 2014 and finished on 14 December 2014.
 Dermot O'Leary presented his eighth series of the main show on ITV and Sarah-Jane Crawford presented spin-off show "The Xtra Factor" on ITV2, replacing Caroline Flack and Matt Richardson.
 Louis Walsh was the only judge from series 10 to return and was joined by former judges Simon Cowell, and Cheryl Fernandez-Versini, and new judge Mel B.
 Sharon Osbourne, Gary Barlow and Nicole Scherzinger left after series 10.
 Former judge Tulisa returned as a guest judge for the final on 13 December due to Mel B being ill.
 The series also saw the lower age limit decreased from 16 to 14, as it was in series 4 and 5.
 This was Walsh's final series as a judge before returning in series 13.
 It was also the only series in which Mel B was a main judge.
 It was O'Leary's final series as presenter on the main show, as he announced on 27 March 2015 that he was leaving to pursue other projects, before returning in series 13.
 On 11 May, Crawford also confirmed via Twitter that she would leave her position as "The Xtra Factor" presenter.
The X Factor is a British television music competition to find new singing talent.
 The eighth series commenced airing on ITV on 20 August 2011 and ended on 11 December 2011.
 The winner was Little Mix, a four-piece girl group known earlier in the series as Rhythmix, consisting of members Jesy Nelson, Perrie Edwards, Leigh-Anne Pinnock, and Jade Thirlwall.
 They became the first act in the groups category to win in the UK show's history with new judge Tulisa emerging as their winning mentor.
 Dermot O'Leary presented the main show on ITV, while Caroline Flack and series 6 runner-up Olly Murs co-presented the spin-off show "The Xtra Factor" on ITV2, replacing Konnie Huq from the previous year.
 Louis Walsh returned to the judging panel and was joined by Gary Barlow, Kelly Rowland and Tulisa.
 Barlow, Rowland and Tulisa joined the panel as replacements for former judges, Simon Cowell, Dannii Minogue and Cheryl Cole.
 Series 5 winner Alexandra Burke served as a guest judge for week 4 of the live shows due to Rowland having a throat infection.