Celebrity Big Brother 2011, also known as Celebrity Big Brother 8, was the eighth series of the British reality television series Celebrity Big Brother. It was the first series of Celebrity Big Brother to air on Channel 5, and the first celebrity series not to air in January since Celebrity Big Brother 2, which was broadcast in November 2002. The series launched on 18 August 2011, and ended after 22 days on 8 September 2011, making it the shortest Channel 5 series. It was followed by the twelfth regular series, which launched the following night after the final. Davina McCall did not return to host the main show, and was replaced by former winner Brian Dowling. Emma Willis presented the spin-off show Big Brother's Bit on the Side, alongside Jamie East and Alice Levine. Marcus Bentley returned as commentator for the live shows and highlights whilst also providing voice over for viewer competitions.