Rufus Wainwright and Princess Yasmin Aga Khan were joking around on an expensive bed at the Alzheimer’s Association cocktail party at the Hampton estate of Anne Hearst and Jay McInerney last weekend. Yasmin Aga Khan quipped, “I couldn’t feel a pea under this mattress if I wanted to,” referencing Hans Christian Andersen’s children’s classic, “The Princess and the Pea.” The $30,000 mattress bed from England’s Savoir Beds will be auctioned off at the Rita Hayworth Gala on Oct. 25 in New York.