Britney Spears is a pop singer ... She has since released eight more studio albums, winning a Grammy for her single "Toxic" in 2004. She headlined a successful Las Vegas residency from 2013 ...

Produced by Bloodshy & Avant and co-written by Cathy Dennis, Toxic was initially ... co-written by Sia. Britney Jean marks Britney Spears' worst performing studio album on the Official Singles ...

Britney Spears is back on the Billboard ... Back in April 2011, Spears sent her album cut to the Dance/Electronic Digital Song Sales chart, but it fell off the list just one frame later.