South Korean pop phenomenon Psy galloped into the record books as his Gangnam Style mega hit smashed through the two-billion mark on YouTube.
It was a first at YouTube, where Baby by Canadian pop singer Justin Bieber in February became the only other video in the billion-view club.
Gangnam Style at the OfficialPsy channel has now had nearly twice the amount of viewers, according to figures from the northern California-based YouTube.
The video became a global sensation and fuelled a South Korean "K-Pop" trend after it was uploaded to YouTube in July 2012.
"Two billion views; they are very honourable and very burdensome numbers," Psy said in a statement YouTube shared on Friday.
"With the appreciation, I will come back soon with more joyful contents!"
His follow-up song Gentleman set the record for the most YouTube views in a single day - 38 million on April 14, 2013.
Psy's horse-riding-style dance moves in Gangnam Style have been parodied and mimicked in myriad videos uploaded to YouTube in various languages.
The Gangnam in the song's title refers to Seoul's wealthiest residential and shopping district, lined with luxury boutiques, top-end bars and restaurants frequented by celebrities.
Psy sings about being the "guy who downs boiling coffee in one shot" and who "goes completely crazy when the right time comes."
The video, which satirises the area's self-importance and ostentatious wealth, has Psy breezing through a world of speed boats, yoga classes and exclusive clubs while performing an eccentric horse-riding dance.
Only three per cent of Gangnam Style views at YouTube have been from inside South Korea.
