Psy is the Korean musician and internet sensation sweeping the globe.  Watch Psy teach Britney Spears and Ellen Degeneres how to get down 'Gangnam Style'.  His advice to the pop star and talk host?  'Dress classy, dance cheesy'.

What is 'Gangnam Style'?  Watch Psy's music video.  Justin Bieber just signed Psy to his music management company!