John Mayer Regrets Dumping Jennifer Aniston?

Is John Mayer pining after ex Jennifer Aniston – or perhaps some much-needed Johnnifer media attention?

The singer - who split from the Friends star a month ago - was reportedly spotted looking glum at SET in South Beach, in spite of the attentions of a blonde beauty.

The ladies man seemed utterly disinterested in her attempts at becoming the next Jen, according to onlookers.

As one eyewitness tells In Touch, “"It was kind of bittersweet for him.

"Miami reminds him so much of the good times he had with Jen, so it was really weird."

"John didn't put moves on her at all, which was strange. He just didn't seem himself. I'm not sure if he is really that over his breakup with Jen."

Meanwhile Jen is reportedly putting her failed romances behind her and focusing on her career.