A picture of Jo Kwon's birthday was revealed online.

Yesterday, 2AM Jo Kwon posted on his twitter, "I've celebrated my birthday at the same place for 12 years. They made me a party hat out of rolling paper. I feel like I am back in my trainee days. I love you all," along with a picture.

In the picture, Jo Kwon is holding a cake while wearing a huge party hat on top of his head. Behind him are the Wonder Girls, celebrating his birthday with him.

Internet users commented, "In a way it's kind of sad, having to spend 12 birthday's in the practice room" and "Happy birthday!"