Big Fat Bass

"Big Fat Bass" is a song recorded by American singer Britney Spears for her seventh studio album, Femme Fatale (2011). It features the vocal collaboration of American rapper will.i.am. 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 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.

Following the release of Femme Fatale, "Big Fat Bass" charted at number 31 on the South Korean International Singles chart, and at number 18 on Billboard's Hot Dance/Electronic Digital Songs for a week. Spears performed the song at Rain Nightclub, Good Morning America and Jimmy Kimmel Live!. The performance on the latter aired after three months due to technical problems. She has also performed it during the Femme Fatale Tour (2011).