Britney Spears and Iggy Azalea's collaboration is official. According to CBS News, their single entitled "Pretty Girls" was released on Monday after previously getting leaked a couple of days ago. The pop/rap track includes lyrics that ask - "Is it true that these men are from Mars/Is that why they be acting bizarre?"

The single comes after Spears fell onstage in one of her Las Vegas gigs - compelling her to postpone some shows.