If you're a fan of the romantic siblings Bar Les Freres and I Fratellini, you might want to take a look at their sexy little sister: Billie-Jean(7610 Wydown Boulevard, Clayton; 314-797-8484), the seventh restaurant for owner Zoë Robinson, opened its doors two weeks ago.The Mediterranean-inspired menu harkens back to Robinson’s first restaurant, Café Zoë, a much-loved (and much-lamented) Lafayette Square spot that featured contemporary American cuisine with Asian influences. Executive chef Ny Vongsaly has even updated a few of the dishes from that first venture, such as the mahogany-glazed spare ribs.…