Vince Vaughn payed a lengthy visit to ex-flame Jennifer Aniston last week, staying the night at the actress’ home in the Hollywood Hills. “Vince didn’t leave until 5 Po the next day,” reveals an eyewitness. Reps for both stars had no comment, however friends of the former lovebirds remain supportive. “It’s no big deal if he stayed over,” a mate of Vince’s says. “They are friends and can be friends with benefits.” A pal of the `Friends’ actress agrees, adding “She can trust him.” However, LA based psychologist Ava Cadell remains skeptical about the no-strings relationship. “It’s difficult for people who have been in a sexual relationship to remain friends,” Ava explains but.But she also admits, “It’s healthy, as long as they both want to do it and it feels good.”