South Korean pop sensation Psy has stormed past Justin Bieber to snatch the title of the most-watched video ever on YouTube.com.

The star's Gangnam Style promo was first posted in July (12), and the rapper's cult following flocked to the site to view the clip.

It has now clocked up more than 815 million views - overtaking Bieber's Baby, which has been watched over 804 million times.

However, it was Bieber who became the first artist to pass 800 million views. The video for Baby, which was posted to YouTube in early 2010, achieved the feat earlier this month (Nov12).