Sparks are indeed still flying between Katy Perry and John Mayer. The Hollywood couple headed to Chicago this Fourth of July weekend. And being two music superstars, the pair couldn’t help but celebrate the festive holiday at a rocking concert. The twosome was spotted getting cozy at the Grateful Dead farewell concert series Saturday night where they listened to tunes from the floor section. Back in May, E! News exclusively confirmed Perry and Mayer were indeed back together. In fact, their visit to the Disneyland Resort in Anaheim, Calif., further proved that these two were so on.