Friends of Russian tycoon Vlad Doronin are surprised Naomi Campbell is still hanging on to him. Whenever he’s in London, he lives with his wife, Katya, and his teenage daughter. And the couple, who have an open marriage, have no immediate plans to divorce. Vlad supposedly bought Naomi a penthouse in Rio last year for $18 million, and she gets to fly private with him everywhere. But why put in so much time with a married man?