Jennifer Aniston has prompted doubts about her relationship with Vince Vaughn, insisting rebound relationships are a bad idea. The actress was linked with Vaughn soon after her split from Brad Pitt, after they met on the set of new movie THE BREAK-UP. Months on, they still haven't confirmed they are an item - and Aniston even suggests she needs time on her own following the end of her marriage to Pitt. She says, "What's hard is the post break-up when you're trying to remember how to be alone. It's not good to jump into another person right away. I think it's key to get back to yourself."