The Circus Starring Britney Spears, commonly referred to as the Circus Tour, was the seventh concert tour by American singer Britney Spears. It was launched in support of her sixth studio album, Circus (2008). Rumors of a tour arose as early as October 2007, after Spears released her fifth studio album Blackout; however, it was cancelled due to unknown reasons. The tour was officially announced in December 2008, with dates... see more