"Big Fat Bass" is a song recorded by American singer Britney Spears for her seventh studio album Femme Fatale (2011). The house song was written and produced by will.i.am as a celebration to the bass and its influence on club music. The song contains a double entendre gender metaphor sung by Spears. "Big Fat Bass" received mixed reviews from contemporary music critics, who deemed it as an instant radio and club hit, and also considered it the most old-school work on the album. However, a few reviews considered it as an unfortunate collaboration with will.i.am, and dismissed Spears' heavily processed vocals.