Britney Spears' much-buzzed collab with Iggy Azalea, "Pretty Girls," has arrived in all it's trip-hop sassy glory. Spears brings the best things to the track: some of her most natural vocals in a long time, a retro chanting chorus, and enough swagger to make this an inevitable drag-queen anthem. Iggy Azalea provides a competent verse, but the most thrilling part of he rhyme is when she references Brit's back catalog. Though the song shares DNA with "Fancy," it (most interestingly) recalls early 2000s Britney (like sexy urban tones of the underrated "Boys" and the fun of "Toxic"). It's one of few tunes this year that sounds like sunshine and summer.