UNUSUAL YOU
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After "Womanizer" "Circus," "If You Seek Amy" and "Radar" is "Unusual You" that Britney Spears has chosen to continue the exploitation of her last album who has so far sold over 3 million copies around the world.
Furthermore, according to the U.S. website
billboard.com, the singer soon will release a new Best Of, "The Singles Collection", with two unreleased songs that should have been included on her latest album, and some new product by Max Martin ( including "Dirty Girl").
Source.
It's supposedly going to be released in the next few weeks to American Radios.