Actress NATALIE PORTMAN is reportedly dating British billionaire NAT ROTHSCHILD. The STAR WARS beauty, 25, dined with the 35-year-old at Wilton's restaurant in central London earlier this week (begs09OCT06), according to British newspaper The Daily Mail. Rothschild has been single since divorcing model ANNABELLE NELSON almost a decade ago, but he seems to have found romance with Portman, who is in Britain making her latest film THE OTHER BOLEYN GIRL, in which she plays HENRY VIII's second wife ANNE BOLEYN. A source told the newspaper, "A casually dressed Natalie and a female friend pulled up in a chauffeured Audi at around 9pm and went into the restaurant. "Nat (Rothschild) arrived on foot five minutes later. After three hours Natalie came out with her pal, who was holding hand's with Nat's friend, and they got into her car. "A bit later, Nat ran down the street, jumped in next to Natalie and they all drove off."