In the film, Britney and her pals perform the song in order to win a karaoke ... Britney Jean marks Britney Spears' worst performing studio album on the Official Singles Chart.

Consider us your guide to the empire that is Britney Spears, from her perfume to her Vegas residency. Revisit Britney's red-carpet fashion at awards shows like the Grammys then follow our Britney ...