Prince William and Princess Kate touched down in Calgary, Canada to attend a rodeo on Thursday. That's when royal watchers waiting to greet the couple at the airport were treated to an unexpected surprise as a gust of wind lifted up the back of Middleton's dress, exposing her underwear. Is this the most sordid scandal to rock Wills and Kate since the couple tied the knot two months ago? It just might be! [Images via Bauer-Griffin, click photo to expand]