Circus (Britney Spears album) "Circus" marked the longest time she had spent recording an album, adding, "I think it is more urban [...] I'm writing every day, right here at the piano in this living room" and also described the album as her best work to date. Producer Claude Kelly discussed the album's initial lack of concept saying, "When I went in with [Dr. Luke] we knew we were going to maybe write something for [Britney], but there was no concept, it was just knowing her style and knowing what she does. Max Martin, who produced Spears' debut single "...Baby One More Time", produced
Britney Spears Candie's, which was released in stores in July 2010. In September 2010, she made a cameo appearance on a Spears-themed tribute episode of American TV show "Glee", titled "Britney/Brittany". The episode drew "Glee"'s highest ratings ever. In March 2011, Spears released her seventh studio album "Femme Fatale". The album peaked at number one in the United States, Canada, and Australia, and peaked inside the top ten on nearly every other chart. Its peak in the United States ties Britney with Mariah Carey and Janet Jackson for the third-most number ones among women. It has sold 1,000,000 copies in the United