Natalie Portman is dating a British multi-millionaire. The 'Closer' actress was wined and dined by Nat Rothschild at Wilton's restaurant in London earlier this week.The pair went to great lengths to avoid being photographed and arrived at the restaurant separately. A source told Britain's Daily Mail newspaper: "A casually dressed Natalie and a female friend pulled up in a chauffeured car at about 9pm and went into the restaurant. Nat arrived on foot five minutes later."Natalie, 25, who is in London making 'The Other Boleyn Girl', stayed at the restaurant for more than three hours and left with Nat. The source added: "After three hours, Natalie came out with her pal, who was holding hands with Nat's friend. Then Nat ran down the street, jumped in next to Natalie and they drove off."Nat Rothschild, one of Britain's most eligible bachelors, will inherit million's as the heir of the Rothschild Jewish banking dynasty. The 35-year-old is a successful financier, and is known for his partying lifestyle.In 1995, he eloped to Las Vegas with socialite Annabelle Neilson. The couple divorced three years later and since then he has been linked with Ivanka Trump. Israeli-born Natalie has reportedly dated a series of gorgeous actors -including Jake Gyllenhaal and Hayden Christensen.