Psy revealed his birthday celebration in Las Vegas.

Although his actual birthday was on December 31, he celebrated it in advance during his appearance at PURE Nightclub in Las Vegas on Saturday, December 29, at the "New Year's Eve Weekend Kick-Off" party.

He shared a tweet on December 31 sharing, "Leaving Vegas, heading to NYC to spend my b-day in Time Square tomorrow," along with the photo of his birthday celebration in Vegas.

In the photo he is seen posing with a cake and two beautiful ladies holding two signs of "Happy Birthday" and "PSY."

Psy is seen with a bright smile in front of a cake both commemorating the 1 billion views of his "Gangnam Style" YouTube video and his 35th birthday.

Fans that saw the photo of Psy's birthday celebration in Las Vegas shared, "Psy must have had a good time celebrating his birthday in Vegas," "Lucky him," and "Psy seems to be enjoying himself."