It's Valerie Bertinelli's turn to entertain her best girl friends at this month's meeting of their 18-year-old book club. Valerie's menu includes Cream Cheese Crab Spread with Homemade Crostini, Butter Lettuce Salad with Hazelnuts and Bacon Bits, Spicy Arrabiata Penne, and for dessert, Helen's Black Pepper Walnut Biscotti and Affogato