Britney Spears beats Rihanna, Gaga; ranked music's sexiest woman in new poll

Who is music's sexiest woman?

Britney Spears is really having a comeback! The 30-year-old newly minted (and highly paid) "X Factor" judge has been voted Music's Sexiest Woman in a Billboard poll, earning 45 percent of the vote.

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Brit Brit beat Lady Gaga, Beyonce, Rihanna and Katy Perry to take the top spot -- and her male alter ego, Jo Calderone, would have made the top 10 as a write-in entry on Billboard's "Sexiest Man" list, but "he" was disqualified due to, well, being a woman.

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Speaking of Lady Gaga, we're kind of surprised that she made the #2 spot, beating out hotties like Beyonce and Rihanna. And all that nipple-flashing must be paying off: 53-year-old Madonna managed to top Jennifer Lopez.

Let us know: Who is music's sexiest woman?