Paul McCartney made a young fan’s wish come true at his Tuesday concert in Buenos Aires, Argentina. He spotted Leila Lacase holding up a sign in the audience and invited her up to jam with him on the Let It Be classic “Get Back.” 

“I didn’t see this coming!” McCartney said as a roadie…

Source: RollingStone
Link: Watch Paul McCartney Jam With Young Fan on 'Get Back'