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.
Big Brother (Australian season 7)
The season finale aired on Day 100 (30 July 2007) in which Aleisha was announced the winner and Zach the runner-up. It was the closest winning margin in Australian Big Brother history of less than 500 votes and the announcement of the winner was delayed by an hour after the voting lines closed as votes were rechecked. At one point during the final episode, there was just 64 votes difference between the last two housemates. Aleisha is the second female to win Big Brother Australia.