Jennifer Aniston is reportedly romancing her latest co-star.
Jennifer and Aaron Eckhart are said to have become inseparable while filming 'Traveling' together in Vancouver, Canada.
A source said: "They're getting along so great that everyone on the set is convinced they are more than just friends. They're just so in sync all the time."
'Erin Brokovich' star Aaron - who recently split from his long-term girlfriend Ashley Wicks - reportedly put Jennifer forward for the role.
The source added to Britain's Daily Mail newspaper: "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 pair are keen to keep their budding romance a secret. The source said: "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."
Since splitting from husband Brad Pitt in January 2005, Jennifer has dated Vince Vaughn and been romantically linked to model Paul Sculfor and actor Jason Lewis. | 
