Jennifer Aniston's beau John Mayer recently headlined a concert for sick kids at a children's hospital in New York.
Mayer performed at the 95.5 WPLJ-FM's 17th Annual Holiday Concert at Blythedale Children's Hospital in the Big Apple, reports Contactmusic.
The hunk was joined by Matchbox Twenty star Rob Thomas for a rendition of Ben E. King's classic track 'Stand by Me'.
While at the event, Mayer signed autographs for ill kids.
The event raised upto 250,000 dollars for the hospital.