Cameron Diaz‘s romance with Jennifer Aniston‘s ex, model Paul Sculfor, is no summer fling!

"She really is happy with Paul," a pal of the actress, 35, tells OK!. Since they started dating, she has a whole new energy. She really likes the guy."

Diaz has been in Tokyo promoting her film What Happens in Vegas, while Paul, 37, has been busy shooting a commercial for Next Clothing in London. Still, the actress is confident their relationship can go the distance.

"She misses Paul, but she is a very confident, carefree girl," the pal says. "The two have a lot in common and are looking forward to seeing each other soon. With the death of her father, this past year has been hard on Cameron. Paul has been a bright spot and has made her smile again."

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