The couple was recently spotted enjoying a romantic dinner at restaurant SunsetTower, located on Hollywood Boulevard.
A source told People: “They are great friends. When Justin is in L.A. from New York, he and Jen have spent a lot of time together lately.”
“Jen was in a great mood and seemed happy to take Justin to her favorite restaurant,” the source added. “They seemed happy and were flirty, but didn’t act like a couple.”
Justin – who has starred in movies like Tropic Thunder, Zoolander, Mulholland Drive – and Jennifer spent three hours chatting and laughing, before disappearing in the parking lot.
However, Aniston’s rep told denied the two actors were in a relationship: “It was a group dinner with six people. It was not a romantic dinner.”