Harry Connick Jr. Performs with Talented Young Girl at 'American Idol' Finale (Video)

Harry Connick Jr. sings on stage during the American Idol series finale on Thursday (April 7) at the Dolby Theatre in Hollywood.

The 48-year-old entertainer was joined by talented young singer Marley Fletcher for a performance of “What a Wonderful World” as a tribute to the amazing charity work Idol has done over the years.

PHOTOS: Check out the latest pics of Harry Connick Jr.

“I’m singing it with somebody and all I can say is regardless of my performance I can tell you in advance it is going to be very special,” Harry teased to Billboard the day before. It sure was a special moment!