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Who needs a stage when you've got the subway?

Michael Bublé gave a surprise performance to New York City subway riders Thursday, stepping onto the platform in a chic black suit to croon The Jackson 5's "Who's Lovin' You."

A cappella group Naturally 7 was on hand to join the 37-year-old dad-to-be at the Lincoln Center subway stop, as fans crowded around, smiling and pulling out their cell phones to capture the impromptu moment.

"Singing in a New York subway is something that has been done for years and years and years, and I feel like it's the most authentic, organic way to make music," Bublé said following the performance. "You see some of the greatest musicians in the world come down here and play."

"Out of all the press I had to do, everything that I'm going to do in Europe and America, this was the thing I was most excited about."

The famed singer's performance celebrated the April 22 release of his album, To Be Loved, which includes his rendition of "Who's Lovin' You" and coincided with the expansion of wireless cell service in NYC's subway system.