Jennifer Aniston's father, soap actor John Aniston, has reportedly suffered a heart attack. The Days of our Lives actor is recouperating at a California hospital and is expected to make a full recovery. A source told Life + Style magazine, "It was a scary few hours before Jen got definitive word from doctors that her dad would be fine." The source also said Jennifer turned to Vince Vaughn for support. "[Vince] cancelled several appointments and stayed by her side. I don't think Jen is ever going to forget what a stand-up guy Vince was and how he really stuck by her just when she needed him the most." Aniston's reps have refused comment.source