Is it chic to e-mail an RSVP? Arrive fashionably late for cocktails? Wear your Armani jeans to an uptown dinner party? If you thought you knew it all, rush to check out 21st Century Etiquette: Charlotte Ford’s Guide to Manners for the Modern Age. Ford’s new A-list survival guide covers everything from perfect party do’s and don’ts to cell phone civility and workplace propriety. And the book launch at the Four Seasons Hotel lured only the best-mannered A-listers (of course!), like Carolina and Reinaldo Hererra, Mary McFadden, Georgette Mosbacher, and Alex Von Furstenberg—not to mention the very polite extended Ford family.