Jennifer Aniston romancing Justin Theroux?

It has emerged that Jennifer Aniston may be secretly dating Justin Theroux, although the actress is trying to keep it low profile.

"Jen is totally into him. They have been hanging out for months," US magazine quoted a source as saying.

"She wants to be with him all the time. She's diving in headfirst. Aniston hasn't dated anyone seriously since John Mayer in 2009," the source added

The two had started off as friends and were co-stars on the set of Wanderlust. But of late, Theroux, 39, and Aniston, 42, have been inseparable.

However, a representative for Aniston had earlier denied the relationship and said Aniton and Theroux were just good friends.