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McCartney/Swift Shake It Off Together

Paul McCartney channeled his inner 15-year-old girl and jammed with Taylor Swift on "Shake It Off" at the "SNL" 40th anniversary after-party Sunday night. Jimmy Fallon joined 'em on stage too. Taylor returned the favor by rocking the Beatles' "Saw Her Standing There". Read more: http://goo.gl/BnwmPh #CelebrityNews

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