While the annual New Year's Rockin' Eve celebration takes place in New York City, Psy was added in the line-up with fellow Schoolboy Record mates The Wanted, Carly Rae Jepsen, and Justin Bieber.
However, Psy brought a big surprise to the crowd as he performed his viral hit 'Gangnam Style' with MC Hammer, Yoo Jaesuk, Noh Hongchul and Haha.
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After the performance, Ryan Seacrest uploaded a photo on his Instagram striking a pose in the cold with the famous Korean celebrities. "Not a bad way to spend your birthday psy_oppa!" the American host captioned the photo. Despite the freezing temperatures, the men enthusiasticly striked a pose in their outfits.
Followers of Seacrest commented on the photo saying, "Psy has the coolest bday date ever!", "I wish I was there!", "Psy + Infinity Challenge Team!" giving great feedback to their appearance.
Psy celebrated his 35th birthday in the famous Time Square on New Year's Eve while performing as part of the Dick Clarke New Year's Rockin' Eve line-up.