John Mayer played guitar with an 11-year-old fan on Sunday (21.02.10).

The 32-year-old singer, who is famous for his celebrity ex-girlfriends including Jennifer Aniston and Jessica Simpson, showed a generous side at the concert in Philadelphia when he spotted the youngster in the crowd clutching a sign reading, "Can I please play 'Belief' with you?"

John pulled 11-year-old Austin out of the audience and performed the song with him to a rapturous round of applause.

John told the crowd at the end, "That's my man!", before giving Austin one of his guitars.

Austin's mother wrote a note to John's management team, which read: "John made an 11-year-old's dream come true. John gave him the guitar after the show and we needed security to get out of the stadium.

"Everyone wanted a picture with him. If you get a chance watch some of the videos on You Tube, it is touching. As John said, 'The kid pulled through.' I just wanted to thank JM for pulling through for Austin."

John also agreed that the Philadelphia show was one of his best, taking to twitter the day after to say: "8 out of 8 band members agree, Philly is always an awesome show. XO J (sic)"