Korean rap star PSY continues to dominate the pop music world, and now, even Madonna is getting in on the Gangnam Style action.

At a recent concert at Madison Square Garden in New York City, Madonna performed a special Give it 2 Me – Gangnam Style mash up with the Korean pop star as a special surprise guest. Afterwards, they even sang a little Hey, Mr. DJ

Now, video of the celebrity duo performing together has gone viral, and is further covered on RollingStone, Celebuzz, ABCNews, and EOnline