Big Brother (Australian season 7)
Big Brother Australia 2007, also known as Big Brother 7, was the seventh season of the Australian reality television series "Big Brother". Episodes were broadcast on Network Ten in Australia, and the first episode aired on 22 April 2007. 
Despite a drop in ratings compared to previous series, and a number of controversies, the then "Big Brother" executive producer Kris Noble considers the year's series a success. At the end of this season's finale broadcast 30 July 2007, it was announced by host Gretel Killeen that "Big Brother" would be returning for an eighth season in 2008. In the finale Aleisha Cowcher was announced winner of "Big Brother Australia 2007". She won by the closest winning margin ever in the Australian series. The news the following day reported a margin of 51% versus 49% – a difference of 65 votes. This was the last season hosted by Gretel Killeen.
List of Big Brother (Australian TV series) shows
The Opening Night is the first episode of the "Big Brother Australia" series that introduces the new housemates and the House for that year. It is currently hosted by Sonia Kruger. Previously, it was hosted by Gretel Killeen from 2001–07, and Kyle Sandilands and Jackie O in 2008. In different seasons it ran under various titles such as "Launch", "In They Go" and "The Secret".