This afternoon, as Book Expo America begins, Tina Brown and Doubleday hosted a luncheon at MoMA's The Modern to celebrate the release of The Diana Chronicles. In the back room, like dwarves, each of the seven tables came with an adorable author of note. Ian McEwan, Kate Christensen, Jeffrey Toobin, Sebastian Faulks, Valerie Martin and Dan Wallace were the literary set pieces and their books, except Brown's (it's still unpublished, though excerpts will be in next week's Vanity Fair), were liberally distributed throughout. We counted two seersucker suits and more than one pair of Converse. The group could choose between sea bass with coco beans and spring vegetables "au pistou" or beef strip loin with morels, wilted lettuce and yukon gold salad. Tina Brown was fashionably late.