The romance between Jennifer Aniston and John Mayer continues to heat up, as Aniston was seen over the weekend backstage at one of Mayer’s concerts. With an audience of tens of thousands, Mayer only had eyes for Aniston, who snapped photos of the singer while he performed. The pair’s romance has been heating up since April, when Mayer was seen visiting the actress on the Miami set of Marley and Me. Although it’s obvious that their relationship is unfolding, neither will confirm the existence of one, instead choosing to keep it on the down low. With visits to London, Amsterdam, Mexico and the States, the pair’s relationship doesn’t seem to be slowing down anytime soon.