We'll admit we've been bitten by the Pippa bug...perhaps attacked. Or eaten alive. But the rest of America? They don't even know who she is.Shocking, we know. But in the August edition of 60 Minutes/Vanity Fair poll, 52 percent of Americans polled responded to the question, "Who is Pippa Middleton?" with a mere "Don't know." Around 32 percent ably answered "British socialite" ("Owner of the world's most famous tush" was not an option).