Jen and Vince's sleepover

Vince Vaughn and Jennifer Aniston had a cozy reunion on Saturday night at Aniston's Hollywood Hills home. "Vince didn't leave until 5 pm the next day," an eyewitness said. A friend of the Friends alum says that if the former couple hooked up, "there's nothing wrong with it. She can trust him." And a Vaughn insider agrees: "It's no big deal if he stayed over. They are friends and can be friends with benefits." Reps for both actors have not commented.

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Jennifer to pimp water

Jennifer Aniston is reportedly close to closing an endorsement deal with Glaceau water to be the face of their next global ad campaign. The Friends alum is expected to appear in ads for smartwater, an "electrolyte enhanced" bottled water. "Jen has a clean image and that's smartwater's whole image, so she's perfect for it," says an insider. No public comments have been issued from Aniston or the water company.

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Jen and Vince: back together?

Are Jennifer Aniston and Vince Vaughn rekindling their romance? Some weekly magazines seem to think so. According to OK!, the former couple are spending a lot of quality time together, and Aniston even made all the arrangements for Vaughn's 37th birthday party. "When Courteney Cox and David Arquette threw a birthday party for Jennifer on the eve of her 38th birthday in February, Vince was there for her, and she wanted to be there for Vince," says a source. "Jennifer made all the arrangements for the dinner herself."