“Extra” welcomed international superstar Psy to The Grove on Monday, September 17. He didn’t know that we planned a covert operation -- a "Gangnam Style" flash mob!
 
Watch as Maria Menounos, Mario Lopez, Psy and fans took over The Grove!


For the complete "Gangnam" flash mob and interview with Psy, tune-in to “Extra” on Wednesday, September 19th.

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