Jennifer Aniston has lunch with John Mayer

Jennifer Aniston and John Mayer dined together in a Miami restaurant Friday.

The restaurant opened its doors for the pair early at 3:30 p.m. for the 90-minute meal. "I was happy to accommodate them," says Charles Bell, general manager of Michael's Genuine Food & Drink.

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

But another witness says, "[It] definitely seemed like a date" for the actress and the singer.

"He had a sandwich," the onlooker said. "She stole some bites and nibbled on a salad."

Aniston, 39, is in Miami filming Marley & Me with Owen Wilson.