'Celebrity Big Brother' is back.

The reality TV show, now in its fourth series after moving to Channel 5, returned with a bang - and a live show - on Thursday night.

lacey big brother

Page 3 model Lacey Banghard arrives at the launch of Celebrity Big Brother on Thursday evening.

Host Brian Dowling introduced the 12 'stars' who have accepted the isolating three-week challenge (in return for some much needed publicity and some cold hard cash) as they braved the cold to a mix of boos and applause.

See all their arrivals in the pictures below...

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  • Celebrity Big Brother - Launch Night

    BOREHAMWOOD, ENGLAND - JANUARY 03: Heidi Montag and Spencer Pratt enter the Celebrity Big Brother House at Elstree Studios on January 3, 2013 in Borehamwood, England. (Photo by Tim Whitby/Getty Images)

  • Celebrity Big Brother Launch - London

    Heidi Montag arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother Launch - London

    Heidi Montag arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • MTV's "The Hills Live: A Hollywood Ending" Finale - Arrivals

    HOLLYWOOD - JULY 13: Actor Spencer Pratt appear in costume across the street from MTV's 'The Hills' Live: A Hollywood Ending Finale at The Roosevelt Hotel on July 13, 2010 in Hollywood, California. (Photo by Frederick M. Brown/Getty Images)

  • Celebrity Big Brother Launch - London

    Heidi Montag arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother Launch - London

    Spencer Pratt arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother Launch - London

    Heidi Montag and Spencer Pratt are sent to the Big Brother Basement at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother Launch - London

    Heidi Montag and Spencer Pratt arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother Launch - London

    Brian Dowling, Heidi Montag and Spencer Pratt arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother Launch - London

    Heidi Montag and Spencer Pratt arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother Launch - London

    Heidi Montag and Spencer Pratt arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother Launch - London

    Claire Richards, Brian Dowling, Neil "Razor" Ruddock, Frankie Dettori and Rylan Clark at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother Launch - London

    Neil "Razor" Ruddock arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother Launch - London

    Neil "Razor" Ruddock arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother - Launch Night

    BOREHAMWOOD, ENGLAND - JANUARY 03: Neil Ruddock enters the Celebrity Big Brother House at Elstree Studios on January 3, 2013 in Borehamwood, England. (Photo by Tim Whitby/Getty Images)

  • Celebrity Big Brother - Launch Night

    BOREHAMWOOD, ENGLAND - JANUARY 03: Neil Ruddock enters the Celebrity Big Brother House at Elstree Studios on January 3, 2013 in Borehamwood, England. (Photo by Tim Whitby/Getty Images)

  • Celebrity Big Brother - Launch Night

    BOREHAMWOOD, ENGLAND - JANUARY 03: Neil Ruddock enters the Celebrity Big Brother House at Elstree Studios on January 3, 2013 in Borehamwood, England. (Photo by Tim Whitby/Getty Images)

  • Celebrity Big Brother Launch - London

    Claire Richards arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother - Launch Night

    BOREHAMWOOD, ENGLAND - JANUARY 03: Lacey Banghard enters the Celebrity Big Brother House at Elstree Studios on January 3, 2013 in Borehamwood, England. (Photo by Tim Whitby/Getty Images)

  • Celebrity Big Brother Launch - London

    Claire Richards arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother - Launch Night

    BOREHAMWOOD, ENGLAND - JANUARY 03: Claire Richards enters the Celebrity Big Brother House at Elstree Studios on January 3, 2013 in Borehamwood, England. (Photo by Tim Whitby/Getty Images)

  • Celebrity Big Brother Launch - London

    Claire Richards arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother - Launch Night

    BOREHAMWOOD, ENGLAND - JANUARY 03: Claire Richards enters the Celebrity Big Brother House at Elstree Studios on January 3, 2013 in Borehamwood, England. (Photo by Tim Whitby/Getty Images)

  • Celebrity Big Brother - Launch Night

    BOREHAMWOOD, ENGLAND - JANUARY 03: Rylan Clark enters the Celebrity Big Brother House at Elstree Studios on January 3, 2013 in Borehamwood, England. (Photo by Tim Whitby/Getty Images)

  • Celebrity Big Brother - Launch Night

    BOREHAMWOOD, ENGLAND - JANUARY 03: Frankie Dettori enters the Celebrity Big Brother House at Elstree Studios on January 3, 2013 in Borehamwood, England. (Photo by Tim Whitby/Getty Images)

  • Celebrity Big Brother - Launch Night

    BOREHAMWOOD, ENGLAND - JANUARY 03: Tricia Penrose enters the Celebrity Big Brother House at Elstree Studios on January 3, 2013 in Borehamwood, England. (Photo by Tim Whitby/Getty Images)

  • Celebrity Big Brother - Launch Night

    BOREHAMWOOD, ENGLAND - JANUARY 03: Tricia Penrose enters the Celebrity Big Brother House at Elstree Studios on January 3, 2013 in Borehamwood, England. (Photo by Tim Whitby/Getty Images)

  • Celebrity Big Brother Launch - London

    Claire Richards arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother Launch - London

    Sam Robertson arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother Launch - London

    Lacey Banghard, Brian Dowling and Sam Robertson arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother Launch - London

    Lacey Banghard arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother - Launch Night

    BOREHAMWOOD, ENGLAND - JANUARY 03: Lacey Banghard enters the Celebrity Big Brother House at Elstree Studios on January 3, 2013 in Borehamwood, England. (Photo by Tim Whitby/Getty Images)

  • Celebrity Big Brother Launch - London

    Lacey Banghard arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother Launch - London

    Lacey Banghard arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother Launch - London

    Sam Robertson arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother Launch - London

    Lacey Banghard and Sam Robertson arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother - Launch Night

    BOREHAMWOOD, ENGLAND - JANUARY 03: Samuel Robertson enters the Celebrity Big Brother House at Elstree Studios on January 3, 2013 in Borehamwood, England. (Photo by Tim Whitby/Getty Images)

  • Celebrity Big Brother Launch - London

    Sam Robertson and Lacey Banghard arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother - Launch Night

    BOREHAMWOOD, ENGLAND - JANUARY 03: Samuel Robertson and Lacey Banghard enter the Celebrity Big Brother House at Elstree Studios on January 3, 2013 in Borehamwood, England. (Photo by Tim Whitby/Getty Images)

  • Celebrity Big Brother Launch - London

    Gillian Taylforth arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother - Launch Night

    BOREHAMWOOD, ENGLAND - JANUARY 03: Gillian Taylforth enters the Celebrity Big Brother House at Elstree Studios on January 3, 2013 in Borehamwood, England. (Photo by Tim Whitby/Getty Images)

  • Celebrity Big Brother Launch - London

    Gillian Taylforth arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother Launch - London

    Brian Dowling and Gillian Tayforth arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother Launch - London

    Gillian Taylforth arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother - Launch Night

    BOREHAMWOOD, ENGLAND - JANUARY 03: Gillian Taylforth enters the Celebrity Big Brother House at Elstree Studios on January 3, 2013 in Borehamwood, England. (Photo by Tim Whitby/Getty Images)

  • Celebrity Big Brother - Launch Night

    BOREHAMWOOD, ENGLAND - JANUARY 03: Gillian Taylforth enters the Celebrity Big Brother House at Elstree Studios on January 3, 2013 in Borehamwood, England. (Photo by Tim Whitby/Getty Images)

  • Celebrity Big Brother Launch - London

    Ryan Maloney arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother Launch - London

    Ryan Maloney arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother Launch - London

    Ryan Maloney arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother Launch - London

    Tricia Penrose arriving at the launch of Celebrity Big Brother 2013, Elstree Studios, Borehamwood.

  • Celebrity Big Brother - Launch Night

    BOREHAMWOOD, ENGLAND - JANUARY 03: Tricia Penrose enters the Celebrity Big Brother House at Elstree Studios on January 3, 2013 in Borehamwood, England. (Photo by Tim Whitby/Getty Images)