Watch Paul McCartney Jam With Young Fan on 'Get Back'

"I didn't see this coming!" says the Beatle

Paul McCartney – inadvertently – invited a 10-year-old to play bass on "Get Back" during his Tuesday concert in Buenos Aires.

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 draped a white bass guitar over the girl's shoulders, NME reports. The instrument dangled near Lacase's feet, but she still plucked along with the Beatle who lowered the mic so she could add vocals. 

"What did you think of that?" the singer asked, triggering thunderous applause. "Muchas gracias," Lacase said into the microphone, unfazed by sharing the stage with rock royalty. 

Rolling Stones, Paul McCartney and Bob Dylan have confirmed their participation in Mega-Fest this fall. Watch here.