ARE THEY?!

PREVIOUSLY: Are John Mayer and Jennifer Aniston back on? Mayer seemed to indicate they might be when he spoke in front of a crowd of 18,000 at his concert on Sunday at the Hollywood Bowl in LA.

"I believe in second chances!" he said, reports the Express. "You might have been a pain in the ass the last time around, but you can still start over again from home base. Next time you get a text from the one you love just text back 'come over' - no matter what happened in the past. If you really love someone, just tell them and be with them."

A woman who resembled Aniston was rumored to be in the wings while Mayer performed, though her rep has not verified she was there.

"He keeps looking, smiling, smirking and winking at her--especially during 'I Don't Trust Myself With Loving You,'" someone emailed E! News during the show.