It was bound to happen. Two powerhouses of South Korea met Tuesday in New York for the first time.

United Nations Secretary General Ban Ki-moon and rapper PSY lavished praise on one another during a photo opportunity at UN headquarters.

The South Korean pop singer, whose smash video for his song Gangnam Style has gone viral, was quick to joke with reporters about the encounter.

"So now you have first and second famous Korean in the same building," PSY said.

Ban joked that he now feels overshadowed by the star, whose video has scored more than half a billion views on YouTube.

The UN chief even risked a few of PSY's trademark dance moves from the video, prompting peals of laughter from the singer.

PSY told reporters he was touched that Ban had watched his video. He called the meeting a momentous occasion for him — even better than when Gangnam Style hit No. 2 on the Billboard Top 100 chart.

The UN chief said the Korean pop star was "cool" and "energetic."

"He's so energetic he can help to end energy crisis," he said.

Ban's office said the encounter was arranged because the two men were mutually interested in meeting one another.

His spokesman, Martin Nesirky, told reporters that although the secretary general usually deals with weighty issues involving conflicts and wars, he also thinks it's important to engage other parts of society.

Ban joked that he was envious of the South Korean rapper.

"I'm a bit jealous. Until two days ago someone told me I am the most famous Korean in the world. Now I have to relinquish. I have no regrets," Ban said.

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  • UN-SKOREA-PSY-BAN

    South Korean singer Psy (R), whose real name is Park Jae-sang, speaks with United Nations Secretary General Ban Ki-Moon (L) just before their meeting October 23, 2012 at UN headquarters in New York. STAN HONDA/AFP/Getty Images

  • UN-SKOREA-PSY-BAN

    South Korean singer Psy (R), whose real name is Park Jae-sang, laughs with United Nations Secretary General Ban Ki-Moon (L) just before therr meeting October 23, 2012 at UN headquarters in New York. STAN HONDA/AFP/Getty Images

  • UN-SKOREA-PSY-BAN

    South Korean singer Psy (R), whose real name is Park Jae-sang, speaks with United Nations Secretary General Ban Ki-Moon (L) just before their meeting October 23, 2012 at UN headquarters in New York. STAN HONDA/AFP/Getty Images

  • Psy Visits UN Secretary General Ban Ki-moon

    NEW YORK, NY - OCTOBER 23: South Korean singer Psy (R), whose real name is Park Jae-sang, visits UN Secretary General Ban Ki-moon at the United Nations on October 23, 2012 in New York City. (Photo by Allison Joyce/Getty Images)

  • Psy Visits UN Secretary General Ban Ki-moon

    NEW YORK, NY - OCTOBER 23: South Korean singer Psy (R), whose real name is Park Jae-sang, visits UN Secretary General Ban Ki-moon at the United Nations on October 23, 2012 in New York City. (Photo by Allison Joyce/Getty Images)

  • Psy Visits UN Secretary General Ban Ki-moon

    NEW YORK, NY - OCTOBER 23: South Korean singer Psy (R), whose real name is Park Jae-sang, visits UN Secretary General Ban Ki-moon at the United Nations on October 23, 2012 in New York City. (Photo by Allison Joyce/Getty Images)

  • UN-SKOREA-PSY-BAN

    South Korean singer Psy (R), whose real name is Park Jae-sang, speaks with United Nations Secretary General Ban Ki-Moon (L) just before their meeting October 23, 2012 at UN headquarters in New York. STAN HONDA/AFP/Getty Images

  • UN-SKOREA-PSY-BAN

    South Korean singer Psy (R), whose real name is Park Jae-sang, speaks with United Nations Secretary General Ban Ki-Moon (L) just before their meeting October 23, 2012 at UN headquarters in New York. STAN HONDA/AFP/Getty Images

  • UN-SKOREA-PSY-BAN

    South Korean singer Psy (R), whose real name Park Jae-sang, does a dance-step with United Nations Secretary General Ban Ki-Moon (L) just before their meeting October 23, 2012 at UN headquarters in New York. STAN HONDA/AFP/Getty Images

  • UN-SKOREA-PSY-BAN

    South Korean singer Psy (R), whose real name Park Jae-sang, does a dance-step with United Nations Secretary General Ban Ki-Moon (L) just before their meeting October 23, 2012 at UN headquarters in New York. STAN HONDA/AFP/Getty Images