She's married to Brian Grazer, the man behind A Beautiful Mind, Apollo 13 and now The Da Vinci Code. The perfect excuse, then, to become an Ivy-lunching, diamonddusted, perfectly coiffured LA wife. But instead she's turned her insider knowledge into a series of scathing satires on Tinseltown. Gaby Wood talks yoga, intimate waxing and celebrity baiting with novelist Gigi Levangie.