South Korean rapper Psy arrives at the 40th American Music Awards in Los Angeles, California, November 18, 2012. [Photo/Agencies]

South Korean rap star Psy's music video "Gangnam Style" on Saturday became the most watched item ever posted to YouTube with more than 800 million views, edging past Canadian teen star Justin Bieber's 2-year-old video for his song "Baby".

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The milestone was the latest pop culture victory for Psy, 34, a portly rap singer known for his slicked-back hair and comic dance style who has become one of the most unlikely global stars of 2012.

Psy succeeded with a video that generated countless parodies and became a media sensation. He gained more fame outside his native country than the more polished singers in South Korea's so-called K-Pop style who have sought to win international audiences.

YouTube, in a post on its Trends blog, said "Gangnam Style" on Saturday surpassed the site's previous record holder, Bieber's 2010 music video "Baby," and by mid-day "Gangnam Style" had reached 805 million views, compared to 803 million for "Baby". Within a few hours, "Gangnam Style" had gone up to more than 809 million views.

"Gangnam Style" was first posted to YouTube in July, and by the following month it began to show huge popularity on YouTube with audiences outside of South Korea.

"It's been a massive hit at a global level unlike anything we've ever seen before," said the YouTube blog.

The blog also said the "velocity" of the video's popularity has been unprecedented for YouTube.