Gangnam Style, released a year ago, made Psy an international star, and is the most popular video of all time on YouTube with 1.7 billion views.
His follow-up video and single Gentleman was inevitably less successful, but still managed to top the charts in a host of countries and has racked up 500 million views since its release in April.
In a recent interview with the Sunday Times magazine, Psy hinted at an alcohol dependency, describing soju -- a Korean liquor brewed from sweet potatoes -- as his "best friend" and "vice partner".
"If I'm happy, I'm drinking, if I'm sad, I'm drinking. If it's raining, I'm drinking, if it's sunny, I'm drinking. If it's hot, I'm drinking, if it's cold, I'm drinking," he told the British newspaper.
He takes a break from liquor "when I'm hungover," he added.