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We put Katy Perry on the cover last summer, and since then, she's developed into even more of an amazing pop starlet. After firing whipped cream from her two's and putting Snoop on another number one, the California girl's second single from her upcoming Teenage Dream album has a video so hot that we're left wondering if Russell Brand is okay with it. The song is all about teenage love---first dance, first kiss, first time having sex. We don't remember high school being this fun.

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