Are Jennifer Aniston and John Mayer dating?

Jennifer Aniston has allegedly had lunch with John Mayer in a Miami restaurant that opened Friday afternoon just for them, and were later spotted holding hands after a lengthy dinner.

Sitting across from each other in a booth at lunch, their heads were close together, and they were engaged in a private conversation, said Charles Bell, general manager of Michael's Genuine Food & Drink in the Miami Design District.

"I can't speculate on what kind of meeting it was but they looked happy and seemed to have a great time," he said in a recent interview.

Aniston, in Miami shooting the movie Marley & Me with Owen Wilson, ordered a chopped chicken salad, while Mayer had a Serrano ham sandwich which "Jen ate some of," says Bell. For dessert, they shared a chocolate-and-peanut-butter layered treat.

Later in the day, the two were seen at Casa Tua on South Beach.

With his arm around her, Mayer, 30, and Aniston, 39, left the restaurant just before 1 a.m. When they returned to her hotel, they were seen holding hands.

"We are very discreet here," the manager of Casa Tua said to reporters, after the two had departed. "That is why we have celebrity guests."

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