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The six-track mix features the hit single "Womanizer," plus new songs "Circus," "Out From Under," "Kill the Lights," "If U Seek Amy" and "Unusual You." For even more Britney goodness, Amazon.com has posted 30-second clips of each song on the album.
Spears, who recently took the stage with Madonna, will celebrate her 27th birthday the day her album is released. – Rennie Dyball
Who's your Favorite Star Under 35? PEOPLE.com and the People's Choice Awards are counting your votes! Click here to vote now!
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