A billion YouTubers go Gangnam Style

The video by 34-year-old pop star PSY was uploaded in July and shows the singer making fun of the extravagant lifestyle of the residents of Gangnam, a neighbourhood where he grew up in the capital, Seoul.

It became an internet sensation around the world, attracting celebrity fans including London Mayor Boris Johnson.

Mr Johnson told the Conservative Party conference in October how he and Prime Minister David Cameron “danced Gangnam-Style the other day, you will be shocked to discover”.

Previously, Justin Bieber’s hit Baby was the site’s most-viewed video but Gangnam Style overtook it on November 24.

PSY have only taken five months to reach the key figure – being viewed millions of times each day.