Celebrity Big Brother is a spin-off of the British reality television series Big Brother, broadcast in the UK and Ireland. Originally broadcast on Channel 4 and E4 and now broadcast on Channel 5 and 5*, it involves a group of celebrities, called housemates, living in isolation from the outside world in a custom-built "house". The actions of the participants are recorded constantly by microphones and cameras situated in each room. Regularly, the housemates nominate two other members of the group each to face eviction; those with the most nominations face a public telephone vote, and the housemate who receives the most public votes is evicted. This procedure continues until the final day, when the viewers vote for who of the remaining participants they want to win the programme. Profits from premium-rate telephone votes are donated to charities such as Comic Relief, Centrepoint and the Samaritans.
During the 2007 series, comments directed to and made about Shilpa Shetty from Jade Goody, Danielle Lloyd, Jo O'Meara and Jack Tweed caused an international racism controversy. The British and Indian governments commented on the issue, while Ofcom decreed that Channel 4 had been guilty of "serious editorial misjudgements" after 54,000 viewers claimed that Shetty had been the victim of racial discrimination. The broadcaster was made to air a series of on-air apologies, and the programme was not included in Channel 4's 2008 schedule; it was replaced by Big Brother: Celebrity Hijack. In 2009, Channel 4's director of television Kevin Lygo announced that Big Brother "had reached a natural end point" and the 2010 edition was the final celebrity series to air on the channel. However, Channel 5 stated in April 2011 that it has signed a two-year deal with Endemol, the show's creators, to air both version of the programme for a reported £220m. The series started on 18 August 2011 and former Big Brother winner Brian Dowling replaced Davina McCall as the programme's presenter. Dowling presented the programme until January 2013, his final series being Celebrity Big Brother 11. Since the twelfth series of the show, Emma Willis has presented.
Jeremy Jackson (left) was one of two contestants to be removed from the programme after breaching the rules in the fifteenth edition. This was the first edition of Celebrity Big Brother to feature a housemate leaving the show in this manner.