The glamorous host of "So You Think You Can Dance" will be co-anchoring CNN's royal wedding coverage along with Piers Morgan and Anderson Cooper. She's also been giving five Kate-and-William-obsessed Americans an inside tour of London for a BBC America reality special called, appropriately enough, "Royally Mad." We caught up with Cat Deeley in New York City right after she sat in for Kelly Ripa on "Live! with Regis & Kelly," and right before a preflight stop at Bergdorf. See what Cat predicts for April 29 and whether she thinks Brits or Americans have the most serious case of royal wedding fever.