Madonna thrilled fans at her New York City show on Tuesday (13Nov12) by introducing South Korean star Psy as her surprise guest.
The Material Girl was performing her hit Give It 2 Me when Psy appeared onstage via a raising platform, much to the delight of the sold-out crowd of nearly 20,000 at Madison Square Garden.
Madonna then showed off her Gangnam Style moves as the duo gave a raunchy performance of the hit anthem.
She told the crowd that Psy had flown "all the way from Frankfurt, Germany this morning" to join her, and admitted she was a big fan of the rapper.
Before jetting to the Big Apple, Psy hinted about his cameo appearance in a post on Twitter.com, writing, "I think tonight I am going to go dance with a friend and make some history. You will see."