AceShowbiz -

Is single and available, Jennifer Aniston sparks rumors of a romance after she is reported to be inseparable from her "Traveling" co-star Aaron Eckhart. An on-the-set insider even described the duo as having great chemistry.

Jennifer and Aaron, as reported by the Daily Mail, have been "inseparable" on the set of "Traveling" in Vancouver, Canada. Added fuel to the dating rumors, Aaron was said to have personally suggested Jennifer for the part of his leading lady in the romantic drama yet his interest might not just be professional.

"They're getting along so great that everyone on the set is gossiping about something more going on between them. They're just so in sync all the time," the on-set source revealed. "They're just so in sync all the time. And Jen's entire reason for doing this movie was Aaron. She's wanted to work with him for years and was completely flattered that she was his first choice to be the leading lady in this movie."

The on-set source went on saying, "I think the fact that both of them have been single for a couple of months is contributing to the chemistry they have on this film, even when they aren't shooting. They genuinely enjoy each other's company. But if they're actually hooking up, they're doing it as quietly as possible."

The dating rumors in fact have not been confirmed yet.

Jennifer's romance with actor Vince Vaughn ended in December 2006 and she had since then been romantically linked to model Paul Sculfor. As of Aaron, he ended his relationship with his long-term girlfriend, musician Kristyn Osborn of country music group SHeDAISY, late last year.