Jennifer Aniston set for more heartache?

After arriving at Vince Vaughn's Malibu home in the afternoon, the Wedding Crashers star didn't leave until the following evening, with an eyewitness revealing, "Vince looked like he'd been having a good time."

Though it's not the first time they've spent the night together since splitting last December, sources say Jen hopes their tryst could be the beginning of a reconciliation.

"Jen would love to have Vince back," says the source. "She loves him and misses him."

But while Jen might be angling to rekindle their on-again/off-again relationship, insiders say the actor is less than committed.

"Vince doesn't necessarily want to get back into a serious relationship with her," says a source, "even though he still wants her in his life."

Meanwhile, Life & Style is reporting that Brad Pitt wants ex-wife Jennifer Aniston back Brad phoned Jennifer Aniston on April 10, intending to pour his heart out about his problems with Angelina Jolie - and ended up revealing his true feelings for Jen!

“Brad told Jen that he missed being with a woman who was his best friend,� the insider says. In fact, he became so emotional, he blurted a shocking confession to Jen: “I think I made a huge mistake leaving you.� Reps for Brad and Jen deny the story, but the insider insists, “There’s no doubt Brad would love to have Jen back.�

In other news, Jennifer Aniston is set to become the face of a luxury brand of water. The former 'Friends' star is reportedly close to signing a deal with Glaceau - the producers of 'smartwater' - to endorse the 'electrolyte enhanced' water drink in their next advertising campaign. A source told Us Weekly magazine: 'Jen has a clean image and that's 'smartwater's' whole image, so she is perfect for it.'