invited Korean rapper PSY onto her show to teach Britney Spears the "invisible horse dance"
from the K-pop sensation's ultra-viral mega-hit
, "Gangnam Style." The result? An object lesson in feel-good hilarity that can only occur when international stars collide. "The mindset of this dance is to dress classy and dance cheesy," PSY advised, approving of Spears' attempt to do the limber dance in high heels
. While her wardrobe ...