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 2007 launch had the smallest ever opening episode audience in all seven Australian "Big Brother" series, and a 14% drop from the previous year's opening night. Network Ten came second overall but lost the night to Nine Network's "60 Minutes". Nevertheless, with an average of 1.549 million viewers, the opening night was Ten's best Sunday night of the year, to date. The series finale was expected to have just under two million viewers, a 10% drop from 2006's finale. Network Ten later announced that the peak audience for the finale was 2.3 million viewers. Crikey's media reporter Glenn Dyer stated that Ten's reported figures were exaggerated, and that the average number of viewers was 1.791 million for the entire show, not 1.9 as Ten had stated, which only accounted for 8.30pm – 10pm. He also said that while the peak of 2.3 million viewers beat the 2006 finale, the average audience was fewer than the 2006 finale's average 1.88 million viewers.
In June, the series ratings were down 5% overall and 13% in the 16- to 39-year-old demographic compared to the previous year's series.