John Mayer And Jennifer Aniston Back Together

11/15/2008 05:12 am ET | Updated May 25, 2011

Jennifer Aniston and John Mayer shared a dinner at New York City's romantic Il Mulino last weekend, sources tell PEOPLE.

"They looked like they were having a fantastic time," says one observer of the Saturday night dinner. A source close to John adds, "They were hanging out this weekend."

Aniston, 39, in New York on business, dined with Mayer, 30, on oysters, ravioli with mushrooms and black truffles and fish.

The night before, Aniston and Mayer joined four others for a dinner at Mantra restaurant in Boston.

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