Working On a New Album (Exclusive). Billboard. March 12, 2015 [2015-04-19]. (原始内容存档于2015-04-20). Britney Spears Reveals Iggy Azalea Collab 'Pretty Girls' Release
international singles "Run the World (Girls)", "Best Thing I Never Had", "Party", "Love onTop" and "Countdown". "Love onTop" won the Grammy Award for Best