Celebrity Big Brother 2010, also known as Celebrity Big Brother 7, was the seventh series of the British reality television series Celebrity Big Brother and the final series to air on Channel 4 and E4. It began on Sunday 3 January 2010 and aired for 27 days until the final on 29 January 2010, making it the longest Channel 4 series of Celebrity Big Brother and the joint-longest series ever, along with Celebrity Big Brother 13 which was initially meant to run for 22 days before being extended,in 2014. The series launched with 6.7 million viewers and went on to become the most watched series of Big Brother UK since the eighth regular series in 2007, averaging 3.7 million viewers per night.