Caroline Louise Flack was born in the Enfield area of Greater London on 9 November 1979, the youngest of the four children of Coca-Cola sales representative Ian Flack and his wife, Christine (née Callis). Shortly after her birth her father was promoted to the company’s management, and the family moved to Thetford, Norfolk. When Flack was seven, they moved again to nearby East Wretham. Flack and her twin sister, Jody, were born when their sister Elizabeth was 10 and their brother Paul, eight. Jody, the elder twin by six minutes, was originally supposed to be called Caroline, but her mother decided the name did not suit her. Flack attended Great Hockham Primary School and Wayland Community High School in Watton, Norfolk. She developed an interest in dancing and performed in village pantomimes while at school. While at school she was given medical treatment for being “very underweight”. Between 1996 and 1999 she studied dancing and musical theatre at the Bodywork Company in Cambridge.

In 2002 Flack gained her break on television playing Michael Jackson’s pet chimpanzee Bubbles on the sketch show Bo’ Selecta! She then presented the International Pepsi Chart Show, before moving to Channel 4 where, in 2005, she presented links between videos on E4 Music and co-presented The Games: Live at Trackside on E4 with Justin Lee Collins. In 2005 she also had a regular segment on the video games show When Games Attack. A year later she co-presented the Saturday morning show TMi with Sam & Mark, which aired on BBC Two and the CBBC Channel. Subsequently, she hosted the CBBC show Escape from Scorpion Island together with Reggie Yates.

Flack hosted the CBBC coverage of Comic Relief Does Fame Academy in March 2007, commenting on the semi-finals of the Eurovision Song Contest 2008 with Paddy O’Connell. She also hosted Big Brother’s Big Mouth during Week 5 of the 2008 series. The Daily Mirror journalist Rob Leigh commented that “her sharp delivery makes her the best presenter they’ve had on this series”. However, this was not the first time that Flack was linked to Big Brother. Before the series began, it had been reported that she was Dermot O’Leary’s replacement on Big Brother’s Little Brother.

In 2009 Flack replaced Kirsty Gallacher as co-host of Gladiators with Ian Wright for the second series on Sky1. In July 2009, she was a substitute presenter on the BBC’s Sunday show Something for the Weekend, while Amanda Hamilton was on maternity leave. In the same year Flack began hosting the ITV2 reality show I’m a Celebrity… Get Me Out of Here NOW! Scheduling clashes with I’m a Celebrity meant that she could not film the next series of TMi, leading to her bowing out after three series. The same year she won BBC Three’s Dancing on Wheels with disabled partner James O’Shea and the pair represented Great Britain in the 2009 Wheelchair Dancing European Championships in Tel Aviv, finishing 16th in their category.

Flack dated Prince Harry in 2009, but the relationship ended quickly after the media began reporting on it, according to her autobiography. In 2011, she had a brief relationship with One Direction member Harry Styles. Around 2014 and 2015, she was in a relationship with Sam Smith’s manager Jack Street. She was briefly engaged to the reality TV personality Andrew Brady in 2018, and dated the rugby player Danny Cipriani in 2019. In 2015 Flack came fifth in FHM’s Sexiest Women.

Flack co-presented the game show The Whole 19 Yards with Vernon Kay on ITV in 2010. She also modelled for the mag Maxim. On 16 February 2010, she presented backstage at the 2010 Brit Awards on ITV2. In November 2010 she returned to host I’m a Celebrity, Get Me out of Here Now! on ITV2.

In 2011 Flack was a team captain on the ITV2 game show Minute to Win It. That year she and Olly Murs presented the eighth series of The Xtra Factor, replacing Konnie Huq. Flack and Murs both returned for the ninth series. Flack returned for the tenth series in 2013, while Murs was replaced by Matt Richardson. On 12 June 2014 it was confirmed that Flack would not return for series 11 and was replaced by Sarah-Jane Crawford.

Flack hosted the ITV2 show Viral Tap in 2014. In December 2014 she reunited with Murs to host a Christmas Day and New Year’s Eve programme on British radio station Magic Radio. Flack was announced as a contestant on the twelfth series of Strictly Come Dancing in 2014. Her professional partner was Pasha Kovalev. The couple earned the first perfect 40 of the series for their salsa in the semi-finals, followed by an additional three in the finals giving them a perfect total of 120 points, a previously unmatched feat. On 20 December 2014 Flack and Kovalev became series champions.

On 16 April 2015 it was announced that Flack, along with Murs would replace Dermot O’Leary as the hosts for the 12th series of The X Factor from August 2015. In February 2016 Flack and Murs confirmed that they would not be returning for the 13th series of The X Factor and were permanently replaced by O’Leary.

Flack began to present ITV2’s Love Island in June 2015 and its spin-off show Love Island: Aftersun when the third series was broadcast from June 2017. On 17 December 2019 she announced that she would be standing down as host for the sixth series following an allegation that she had assaulted her boyfriend.

In December 2015, she was part of the presenting team for ITV’s Christmas telethon Text Santa. In May 2016 she began co-presenting Sunday Morning Breakfast from 9 am to noon over the summer with Gethin Jones across the Heart Network.

Flack published her autobiography Storm in a C-Cup in 2015. Following her death, it was reissued in 2020, with further information about her battles with anxiety.

On 13 December 2019 Flack was charged with assaulting her boyfriend, the tennis player Lewis Burton, after an incident at her Islington flat the previous morning. Flack allegedly confessed “I did it” to police when they arrived, and then warned she would kill herself. On 17 December, Flack stood down from hosting Love Island in order to “not detract attention from the upcoming series”. It was later reported that Flack was glad for the break from her hosting role as she was experiencing “personal issues” and had been suffering from an emotional breakdown for “a very long time”. Despite this, the show’s producers said that the “door was open” for a possible future return as host. Flack pleaded not guilty to the charges at Highbury Corner Magistrates’ Court on 23 December. Her solicitor told the court that Burton did not support the prosecution and that “he is not the victim, as he would say, he was a witness”. She was released on bail with the condition that she did not contact Burton and was due to stand trial on 4 March 2020. Burton posted an affectionate Valentine’s Day message to Instagram the day before she died. Flack’s management criticised the CPS for pressing ahead with what her management termed a “show trial”, even after her boyfriend said he did not support the prosecution.

Flack had been due to present a reality series about cosmetic surgery called The Surjury on Channel 4, but it was cancelled following her death in February 2020. She has a cameo role in the film Greed, which was released on 21 February 2020. The trailer, which featured her role, premiered on the same day.

Flack was found dead in her flat, in Stoke Newington, London, on 15 February 2020, aged 40. The lawyer acting for her family stated that her death was a suicide. A Love Island highlights episode, due to be shown on ITV2 on the day of her death, was cancelled. The inquest into her death opened on 19 February and heard she had been found hanged in her flat. The inquest was adjourned until 5 August 2020. E4 pulled a Love Island sketch on Robot Chicken involving Bitch Pudding out of respect due to her suicide. On 6 August, after a two-day hearing, the coroner found that Flack’s death was a suicide. She had killed herself after learning she would be prosecuted for allegedly assaulting her boyfriend, following a long struggle with “fluctuating mental health” that was exacerbated by the stress of fame.