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It seems like everyone in Hollywood wants (and tries) to be a singer... but that doesn't mean they're actually good at it!

So we've put together a gallery of the sexiest singers we can think of - the pop stars, like Britney, Justin and Madonna, tween sensations like Miley and the Jonas Brothers, and even country gals like Jessica and Carrie - and ask you: Who's the best?

Not to mention...

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...who's the worst?