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