Madonna thrilled one of her most famous fans at a gig in Chicago, Illinois last week (19Sep12) when she caught his eye in the audience and invited him to sing part of her Like A Prayer hit.

Shaun Sperling became an Internet sensation when he posted footage of him performing his idol's Vogue at his 1992 bar mitzvah online - and he is back in vogue as an adult thanks to a new cyber video.

Sperling was clearly stunned when Madonna handed him the microphone at her United Center concert and he later took to his Facebook.com page to coo about his encounter with the pop superstar.

He wrote, "Madonna came right up to me and we locked eyes, she pointed the mic at me and I sang a verse. She smiled and gave me a thumbs up like she knew!"