On the stage of the Radio City Music Hall, Lady Gaga sang New York, New York before Bennett joined her on stage.

According to CNN, the 35-year-old said: “He’s my friend. He’s my musical companion. And he’s the greatest singer in the whole world.

“And I’m counting on you, New York, to make him smile. So you better cheer. You better yell. You better laugh. You better cry. You better give your soul.”

The World War II veteran received a standing ovation before even singing a note and more followed throughout the night.