Feb 14, 2011 16:05 GMT  ·  By

Jennifer Aniston and Jake Gyllenhaal have remained close friends since they worked together on a film in 2002 – but there may be some evidence that they’re more than friends, Life & Style reports.

Since they’re both single and ready to mingle, as the saying goes, the two may have actually done some mingling together, claims the tab citing reliable eyewitnesses.

Just recently, Aniston celebrated her birthday with a dinner party that included, among some of her best friends, Jake. And it doesn’t stop here either.

According to spies speaking to Life & Style, the two were very flirty throughout dinner – and even went to the trouble of leaving separately so as not to appear suspicious.

Had they been just good friends, they would not have gone through all this trouble, the mag seems to be saying.

“The startlet took a break from her whirlwind promotional tour for her new film Just Go With It and made her way to The Spotted Pig restaurant where she dined in a private room with a group of friends and her former hunky co-star,” the publication writes.

It even has an eyewitness to confirm that, indeed, the two did have dinner and, indeed, they did act like there was more between them than just friendship.

“Jake and Jen looked really happy and really seemed to be enjoying themselves. They looked like they were strategizing a way to exit the restaurant probably because they didn’t want to be photographed together,” says the spy.

After dinner, the two left the restaurant separately, but the spy doesn’t rule out the possibility they met up later, when they would have gotten rid of the paparazzi.

“Shortly after their discussion Jen exited the restaurant with her friends in tow. Though Jake was not in the group, it is possible he could have snuck out the back door while no one was looking,” Life & Style writes.

Moreover, this is not the first time that Jake and Jen get people talking about a possible romance: they were also “flirty” at a pre-Golden Globes 2011 party, another insider dishes.

Aniston is currently on vacation in Mexico. Each year, she makes a habit out of a flying out a bunch of friends there for a whole week to celebrate her birthday. We’ll probably know more of this, if there’s anything to know, when she gets back.