Madonna Gangnam Style with PSY in New York 2012

Madonna Gangnam Style with PSY in New York 2012

Gangnam Style' star joins Madonna onstage in NYC

Madonna has gone "Gangnam Style."

Korean pop star PSY joined the pop icon Tuesday night during her second show this week at Madison Square Garden. They danced to his pop culture anthem "Gangnam Style" and to her jam "Music" in front of nearly 20,000.

Madonna said PSY flew "all the way from Frankfurt, Germany this morning." She also said she was a big fan of the rapper and loved his su