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 Britain" that she had extended her contract with The AXIS and Planet Hollywood Resort & Casino, to continue Britney: Piece of Me for two additional years. In March 2015, it was confirmed by "People" magazine that Spears would release a new single, "Pretty Girls", with Iggy Azalea, on May 4, 2015. The song debuted and peaked at number 29 on the "Billboard" Hot 100 and charted moderately in international territories. Spears and Azalea performed the track live at the 2015 Billboard Music Awards from The AXIS, the home of Spears's residency, to positive critical response. "Entertainment Weekly" praised the performance,