There are very few shows in which the set earns more applause than its top-billed TV stars, but the breezy Broadway revival of the 1946 comedy Born Yesterday is one of them. John Lee Beatty has designed a radiant art deco gem of a hotel suite with gilded fixtures, glimmering onyx woodwork, ruby-red upholstery, and satiny sapphire walls. Topped off by fat swirls of curlicue chalk-white molding, it is - just as playwright Garson Kanin dictated in his stage directions - 'a masterpiece of offensive good taste.' No wonder it trumps Robert Sean Leonard's entrance. And, a few minutes later, Jim Belushi's entrance. But after Nina Arianda slinks her way down the center staircase, curtsies clumsily, and storms back up the steps, the set doesn't seem quite as glossy. As bubble-headed bottle blonde Billie Dawn - a role that won Judy Holliday an Oscar in 1950 - Arianda is giving a performance that could be called breakout, though breakout somehow seems insufficient.