Jennifer Aniston Shares Friendly Dinner with Justin Theroux

05/19/2011 at 02:10 PM EDT

Jennifer Aniston & Justin Theroux Dinner Date
Jennifer Aniston and Justin Theroux
Jason Merritt/Getty; Splash News Online
Yes, Jennifer Aniston went out for a casual dinner with writer-actor Justin Theroux – but are they more than just friends?

"They are great friends," a source tells PEOPLE after the Wanderlust costars dined Wednesday at Los Angeles's Sunset Tower Hotel, a favorite Aniston spot. "When Justin is in L.A. from New York, he and Jen have spent a lot of time together lately."

The two arrived separately, though the source says they came from Aniston's house, where they also returned after their three-hour meal.

"Jen was in a great mood and seemed happy to take Justin to her favorite restaurant," the source says. "They seemed happy and were flirty, but didn't act like a couple."

According to the source, the duo have spent a lot of time together since March, when Aniston, 42, was spotted visiting Theroux, 39, at the Chateau Marmont in L.A.

A rep for Aniston tells PEOPLE of Wednesday's outing, "It was a group dinner with six people. It was not a romantic dinner." News of their dinner was first reported by

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