Jennifer Aniston is "moving at a snail's pace" with Bradley Cooper.

The actress - who was previously married to Brad Pitt and has dated stars including Vince Vaughn, Paul Sculfor and John Mayer - has reportedly grown close to her 'He's Just Not That Into You' co-star but wants to take the romance slowly after so many of her previous relationships ended badly.

A source said: "They're both sticking their toes in the water. She's moving at a snail's pace about all this. It's not a romance yet, but they are interested in each other."

Friends are hoping that Jennifer - who was seen leaving romantic New York restaurant Il Cantinori with Bradley earlier this week - can make a success of her fledgling new relationship.

The source added to America's OK! magazine: "He's so right for her, in my opinion, that I hope it turns into more. They certainly have a chemistry."