The Russians are coming—and bringing their fur coats, Dolce & Gabbana minidresses and overdressed Yorkshire Terriers to some of New York's toniest addresses. Ekaterina Rybolovleva's father Dmitry set a real estate record in December when he bought ex-Citigroup chairman Sandy Weill's Central Park West penthouse for $88 million. "Katia," a sweet-faced equestrian and part-time college student, is just the latest in a sorority of billionairesses to land on our shores. Check out a gallery of the most glamorous of New York's Russian dolls.