Socialite Claiborne Swanson Frank’s new book is officially called “American Beauty,” but it’s being dubbed “The Yearbook” in New York social circles, sources say. The tome includes 100 photo portraits of well-heeled women, including Aerin Lauder, Alina Cho, Georgina Bloomberg, Lauren Santo Domingo, Bettina Prentice, Arden Wohl and Solange Knowles. And the Assouline publication is getting nearly as much attention from the social set for who was left out as who made the cut. (Sorry, Tins!) At a Park Avenue party hosted by Tod’s and Vogue, Lily Aldridge showed off a different look than on the book’s cover: The Victoria’s Secret model is pregnant with rocker Caleb Followill’s baby, and we hear she’s due on June 15. Knowles spun tunes, then headed to Moscow for another DJ gig. Swanson’s ex-editor Anna Wintour presided at the bash while Tyler and Cameron Winklevoss added a dash of testosterone to the room. Gallery Lu Magnus will show prints from the book through May 20.