Bad Girls Club 4 is the fourth season of the Oxygen reality television series, Bad Girls Club. The fourth season was also the last season to film in Los Angeles, California until season six. Bad Girls Club 4 became Oxygen’s “most watched Television show” beating out the previous season. Bad Girls Club 4 premiered on Oxygen on December 1, 2009. The two-part reunion special aired March 16, 2010, and part two on March 23, 2010, with Perez Hilton returning as the host. Season 4 was the first season to have had a two part reunion show.