For a royal ex, Sarah "Fergie" Ferguson sure gets around—charity galas, her own series of children's books. Sure, she's no longer the wife of Andrew, Duke of York. Heck, she may not even be invited to the royal wedding. But with friends like Oprah (Fergie has been taping her own show for the OWN Network), who cares? As for the Middleton's own designated socialite, it's probably Pippa, Kate's younger sister. Pippa, 27, is an events planner recently dubbed by Tatler magazine as "the Number 1 Society Singleton."