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Bonnie McKee, "American Girl"
If Bonnie McKee's new single sounds familiar, it's because you've heard her work before. The Los Angeles-based singer-songwriter has collaborated on some of the biggest hits of the past couple years (like practically all of Katy Perry's smashes), which is how she scored a number of major celebs in the first video for this single. But McKee takes center stage in the latest clip in a series of truly ridiculous outfits (beware the underbutt, y'all).