Last month, John Mayer complained to fans online about internet speculation that he and 'The Switch' star Jennifer Aniston were back together (yet he never outright denied it). Meanwhile, witnesses continue to spot the former couple hanging out. This weekend, RadarOnline reports that when Mayer gave a concert Wednesday near Atlanta, where Aniston is shooting the Judd Apatow film 'Wanderlust,' the actress quietly slipped backstage in "workout clothes" and a baseball cap for a chat with her ex, and more.

"She looked gorgeous and seemed to be really enjoying herself," a source told Radar. "She and John laughed a lot."