AceShowbiz -

Katy Perry fueled rumors that she and her on-again, off-again boyfriend John Mayer are rekindling their romance. The "Firework" songstress was photographed getting cozy to the 37-year-old singer at Grateful Dead concert on Saturday night, July 4 in Chicago.

As seen in a picture of the couple taken at the concert and obtained by TMZ, Perry wrapped her arms around Mayer from behind as they enjoyed a performance by the rock band. In another snapshot, Perry was caught leaning in to tell Mayer something.

Perry sported a pair of ripped blue jeans and a tie-dye spaghetti trapped shirt for the outing. She finished her look with a pair of sunglasses and a white handbag. As for Mayer, he donned dark jeans and a stonewashed denim shirt over a white T-shirt. He accessorized the casual outfit with dark-rimmed glasses, a silver beaded necklace and a blue bandana on his head.

Perry, who divorced from Russell Brand back in 2012, started dating Mayer following the divorce. Although Perry and Mayer allegedly split earlier this year, the pair were spotted in late April spending time together at Disneyland in Anaheim, California.

During the vacation, the twosome looked like they're avoiding people's attention as they sported matching hoodies. They reportedly didn't leave the theme park until its closing time in the midnight.