Celebrity Big Brother 9 was the ninth series of Celebrity Big Brother UK that began on 5 January 2012 and ended on 27 January 2012. It was the second Celebrity series to air on Channel 5 as part of the channel's current two year contract with the show and the ninth series of the show to air overall. The series was sponsored by Plusnet. The series was won by actress and television presenter Denise Welch.