LOS ANGELES, CA  [Tuesday Oct.17.2006]  /WMQT.com/ -- During a John Mayer/Sheryl Crow concert, the young hunk caught the singer off-guard when he came out on stage wearing a bear costume.

Mayer pulled the prank as Crow sang "My Favorite Mistake," and, according to Mayer's blog, caused her to lose her place in the song. He said she also found herself in the embarassing position of "leaning against a douchebag in a bear suit."

The next night, however, Crow turned the tables on Mayer, showing up on stage in a very sexy bikini.

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