Big Bang member G-Dragon appeared at Psy's "Happening" concert as a special guest and heated up the crowd.

April 13, G-Dragon of idol group Big Bang appeared at the World Cup Stadium in Seoul to appear at Psy's "Happening" concert as a special guest.

G-Dragon performed his hit song "One of a Kind" and took a break to speak to the fans in the crowd. G-Dragon stated, "I begged Psy to let me appear as a special guest at his concert." G-Dragon shook up the crowd with his charismatic energy that filled the stadium.

G-Dragon continued, "Psy's audience is unbelievably amazing, just as they are famous. Could I pretend that this is my own concert for a moment? I want to borrow your screams for a little bit."

Big Bang's G-Dragon Performs at Psy's Happening Concert in Seoul [PHOTOS]  

Then, G-Dragon continued his performance with the song "Crayon" and "Fantastic Baby" to heat up the crowd. G-Dragon successfully completed his performances on stage and added to the excitement of this huge production that was being aired live worldwide.

On April 12, Psy's new song "Gentleman" was released in a total of 119 different countries. Psy wrote the lyrics while the music was the result of a collaboration of Psy and Yoo Gun Hyung. The addicting lyrics drew attention for its tendency to get stuck in our heads. As soon as "Gentleman" was released, it topped 9 different music charts in Korea.

See Photo Slide Shows

PSY Attends a Press Conference Before 'Happening' Concert to Introduce His New Single 'Gentleman' at Seoul World Cup Stadium on April 13 [PHOTOS]

PSY's 'Happening' Concert - First Live Performance of 'Gentleman' [PHOTOS]

Psy Dances To Beyoncé's 'Single Ladies' at Happening Concert in Seoul - April 13, 2013 [PHOTOS]