Question: "Shout Out to My Ex" is a song by a British girl group that formed in what year?

Context articles: Glory Days (Little Mix album)
Jodi Albert
Greatest Hits (Eternal album)
Little Mix discography
The Get Weird Tour
He Was Really Sayin' Somethin'
Ugly (Sugababes song)
Shout Out to My Ex
Little Mix
My Love Is Pink

Glory Days is the fourth studio album by British girl group Little Mix.
 It was released on 18 November 2016, by Syco Music and Columbia Records.
 The album was preceded by the UK number-one single "Shout Out to My Ex", released a month before.
 The single later won the Best British Single award at 2017 BRIT Awards.
 The album debuted at number one on the UK Albums Chart; it later became their first album to yield more than two top ten singles when the fourth single, "Power", reached number six on the UK Singles Chart.
 The album has sold over 600,000 copies in the U.K and over 1 million copies worlwide.
Jodi Mary Albert (born 22 July 1983) is an English actress and singer, best known for playing Debbie Dean in the Channel 4 soap opera "Hollyoaks", and as a member of short-lived British girl group Girl Thing and Irish girl group Wonderland.
 In December 2013, it was announced that Girl Thing would be reuniting for the second series of "The Big Reunion".
Greatest Hits is the first compilation album by the British girl group Eternal, released in October 1997.
 The album contains their fourteen consecutive Top 15 hit singles, which at the time was an unprecedented record for a British girl group.
 Louise Nurding's vocals appeared on the album, however she was not featured on the cover.
The discography of British girl group Little Mix consists of four studio albums, seventeen singles and eighteen music videos. Having become the first ever group to win the show, winners of "The X Factor" Little Mix released their debut single "Cannonball" a cover of Damien Rice's single in December 2011.
 The single became the group's first number-one single when it topped the UK Singles Chart.
 The lead single from their debut album "Wings" became their second number one single in the UK.
 It also reached number three in Australia and number 14 in the New Zealand.
 In November 2012, Little Mix released their debut album "DNA".
 The album peaked inside the top 10 in ten countries, including the UK where it debuted number three.
 The album has been certified Platinum in the UK where it has sold 391,447 copies there as of April 2016.
 In May 2013, the group released their debut album in the United States, where it debuted at number four, becoming the highest debut from a British girl group in the US, beating a record previously held by the Spice Girls, who debuted at number six with their debut album "Spice" in 1996.
 "DNA" spawned three more singles; the top three hit and title track "DNA" and the top 20 singles "Change Your Life" and "How Ya Doin'?
".
The Get Weird Tour was the third concert tour by British girl group Little Mix, in support of their third studio album, "Get Weird".
 The tour was announced in July 2015.
 It began on 13 March 2016 in Cardiff and ended on 27 August 2016 in Newmarket.
 It took place in Europe, Oceania and Asia with a total of 60 shows.
 It also became the 5th highest grossing girl group tour of all time and this decade's highest grossing girl group tour.
"He Was Really Sayin' Somethin' is a soul song written by Motown songwriters Norman Whitfield, William "Mickey" Stevenson, and Edward Holland, Jr. in 1964.
 The song is notable in both a 1964 version by American Motown girl group the Velvelettes, and a 1982 hit version (with the title altered to "Really Saying Something") by British girl group Bananarama.
"Ugly" is a song by British girl group Sugababes from their fourth studio album, "Taller in More Ways" (2005).
 Written and produced by Dallas Austin, inspiration for the song was conceptualised in the midst of reading negative comments about members of the band.
 The song released on 5 December 2005 in the United Kingdom as the second single from the album.
 "Ugly" is a midtempo pop and R&B ballad that contains lyrics about personality and body-image issues.
 It received comparisons to "Unpretty" by girl group TLC and "Beautiful" by Christina Aguilera.
 Ugly is the band's final single released under the second line up of Sugababes, after original member Mutya Buena departed the group in December 2005.
"Shout Out to My Ex" is a song by British girl group Little Mix.
 It is the first single from their fourth studio album "Glory Days" (2016) and premiered on "The X Factor" live shows on 16 October 2016, becoming the band's fourth number-one single in the United Kingdom.
 The track was written by Edvard Førre Erfjord, Henrik Michelsen, Camille Purcell, Iain James and Little Mix, with production credits from Erfjord and Michelsen under their production monikers, Electric.
Little Mix are a British girl group formed in 2011 during the eighth series of the UK version of "The X Factor".
 They are the first and, so far, only group to win the competition.
 Following their victory, they signed with Simon Cowell's record label Syco Music and released a cover of Damien Rice's "Cannonball" as their winner's single.
 The members are Jade Thirlwall, Perrie Edwards, Leigh-Anne Pinnock, and Jesy Nelson.
"My Love Is Pink" is a song by English girl group Sugababes from their fifth studio album, "Change" (2007).
 It was written by band members Keisha Buchanan and Heidi Range in collaboration with the songwriting and production team Xenomania, who produced the song.
 "My Love Is Pink" is an uptempo dance, electro and pop song, reminiscent of those performed by British girl group, Girls Aloud.
 The song was released on 10 December 2007 in the United Kingdom and Ireland as the second single from "Change".
 It received mixed reviews from critics, who praised the composition and sound, but criticised its lyrical content.
 The song peaked at number five on the UK Commercial Pop Club chart and number 51 on the Slovakian Singles Chart.
 The Sugababes performed "My Love Is Pink" at the Oxegen 2008 festival.