'Gangnam Style' most watched YouTube video ever

South Korean rapper PSY, who sings the popular "Gangnam Style," performs during his concert in front of Seoul City Hall in Seoul, South Korea in October.

SEOUL, South Korea — South Korean rapper PSY's “Gangnam Style” has become YouTube's most viewed video of all time.

YouTube says in a posting on its Trends blog that “Gangnam Style” had been viewed 820 million times as of Sunday afternoon, surpassing Justin Bieber's “Baby,” which has had 804 million views.

The blog says the “velocity of popularity for PSY's outlandish video is unprecedented.”

PSY's video featuring his horse-riding dance was posted on YouTube in July, while “Baby” was uploaded in February 2010.

PSY's video has become a global sensation, with many people around the world mimicking his “Gangnam Style” dance. In their October meeting, U.N. Secretary-General Ban Ki-moon, a South Korean, joked that he had to relinquish his title as “the most famous Korean,” and tried a few of PSY's dance moves.