The Aerosmith frontman joined a male busker on the band's hit single "I Don't Want to Miss a Thing" as the street musician strummed his guitar, reported Ace Showbiz.
After the song was finished, Tyler, 67, gave the busker a high five, put his hat on the fan's head, and then posed for a picture together.
The crowd gathering around them cheered and shouted thank you in Russian to the star for his surprise performance.
The former "American Idol" judge was in Russia with his band to perform at Lubyanskaya Square to celebrate Moscow City Day.
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