Bauer Griffin, Photo Agency
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When you're shaking it onstage in front of thousands of audience members, you want to look good. That's why pop stars like Lady Gaga and Katy Perry have ditched silly, superfluous  items like pants and chosen ensembles that focus on what people really want to see: butt, boobs and abs. Hey, they've worked hard enough for it -- they might as well show it off.