When you first heard the lyrics to Katy Perry's latest hit, "Part of Me," you probably were not thinking army fatigues and war paint, but for Perry, the combat boots fit the song perfectly. "This song feels like one of the most aggressive songs I've ever put out," Perry told MTV News. "It's kind of like an affirmation of strength, so I wanted to go the strongest route I possibly could, so I had this idea — what if I joined the service."

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