"Gangnam Style," a music video featuring the infectious, meme-ready dance moves of a little-known South Korean rapper named Psy, became the most-watched video in YouTube history in 2012, racking up ... more 
"Gangnam Style," a music video featuring the infectious, meme-ready dance moves of a little-known South Korean rapper named Psy, became the most-watched video in YouTube history in 2012, racking up more than 815 million views and knocking Justin Bieber off the most-viewed throne. (Kevin Mazur/WireImage) less 
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| Photo By Kevin Mazur
Sun, Dec 2, 2012 9:00 PM EST