John Mayer separated from Jennifer Aniston long enough to spend some quality time with the other love in his life, his guitar. He performed at a Children's Hospital in NY as part of a live broadcast and auction for a local radio station yesterday. John also talked to the kids and signed autographs, along with a few other celebs like Rob Thomas. As much fun as it was to spot John up close and personal over the weekend, it's even more heartwarming to see him spreading cheer to kids who are spending the holiday season in the hospital.

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