"Extra" welcomed international superstar Psy and surprised him with a "Gangnam Style" flash mob! Watch as Maria Menounos, Mario Lopez, Psy and fans took over The Grove!


Before the flash mob broke out, Psy spilled to hosts Mario and Maria about his night out with singer Usher. "He was really awesome, but unfortunately, he had not that high tolerance about alcohol."

Watch the full interview.
 


Watch behind-the-scenes!

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