Celebrity Big Brother 2007, also known as Celebrity Big Brother 5, was the highly controversial fifth series of the British reality television series Celebrity Big Brother. The series was broadcast on Channel 4 in the UK (also on S4C in Wales), from 3 January 2007 and ran for 26 days with the finale on 28 January 2007. Davina McCall returned as host. It was the first Celebrity Big Brother series to be shown in the 16:9 widescreen format.