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Taylor Swift's

Body Is a Wonderland

5/23/2009 12:30 PM PDT BY TMZ STAFF

Last night at The Staples Center in Los Angeles, John Mayer showed up in the middle of Taylor Swift's concert to sing "Your Body Is a Wonderland" with the hot country star.



And, no, there's nothing weird about John serenading Taylor. She's 19.

The thousands of screaming tween girls, on the other hand ...

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