Jennifer Aniston is John Mayer's Biggest Fangirl

Jennifer Aniston grabs hold of musician boyfriend John Mayer in the backstage area at the Hard Rock Calling festival in London’s Hyde Park on Saturday.

Aniston quietly took pictures in the wings of the stage as Mayer performed a 45-minute set in front of an audience of ten of thousands.

Jen wore a black-and-white floral halter-neck top, faded flared jeans and topped off her outfit with a purple Matta “Dupatta” scarf.

20+ pictures inside of Janiston‘s concert lovefest…