“She’s let Vince back into her life but only to a point- it’s obvious she’s going out with other guys, as well, which drives him crazy.�

Another source adds that Vince fell into a deep funk after splitting with Jen in December.

“He was in a foul mood while filming Fred Claus in London,� says the source. “He tried to play like he was ok, bu the was hurting. It’s like the light went out of his life. He has been trying to win her back ever since.�

Meanwhile Usmagazine.com is reporting that Jennifer Aniston is closing a deal with Glaceau, the makers of smartwater, to be the face of its next worldwide advertising campaign.

Aniston, who over the years has appeared in ads for everything from Heineken beer to Lynx deodorant, is expected to appear in ads for smartwater, an "electrolyte enhanced" drink with the slogan "water that's the envy of all water."

Says a source close to the deal, "Jen has a clean image and that's smartwater's whole image, so she's perfect for it."