I'll admit, when Kellie Pickler was "what's a ballsy"-ing her way through season five of "American Idol," I did occasionally question her intelligence. But is she smarter than a fifth grader? I guess we'll soon find out. Pickler is among the celebrities who will guest-star on "Are You Smarter than a Fifth Grader" during November sweeps. Also going to the head of the class: Clay Aiken, Regis Philbin, Billy Bush, Tony Hawk, and Miss America (Lauren Nelson). They're playing for charity, so I imagine that they'll all be doing their best, and not intentionally mispronouncing words to seem cuter (ahem, Pickler). But which of them — if any — do you think has the greatest chance of taking home the $1 million top prize?