Psy's "Gangnam Style" passed Justin Bieber's "Baby" to become the most-watched YouTube video of all time.
The video has more than 815 million views since it was uploaded to YouTube on July 15th.
Justin Bieber's "Baby," had been watched more than 803 million times since it was posted in February 2010.
Psy Tweeted: "#GangnamStyle just became the most watched video @YouTube! #History."
According to the Guinness Book of World Records, "Gangnam Style" already has the title for "most liked" video in YouTube history with more than 2 million "likes".
The video for LMFAO's "Party Rock Anthem" is second with more than 1.6 million "likes." Bieber's "Baby" is no. 3 in that category.