For those who believe Bloomingdale's is not a store but an attitude, this is the ultimate extension: pointers on perfect entertaining, from the ideal 48-bottle wine cellar to instructions on stifling the Odious Guest. The Batterberrys maintain that ""natural elegance"" can be acquired, and knowing the preferences and recipes of famous party-givers can help you get it. Whether you are having a barbecue or a formal dinner for 65, style is what counts. Forget your budget, and pass the camembert mousse.