Sir Paul McCartney fans cheered on as a 10-year-old girl walked on stage and asked if she could play the bass alongside the former Beatle.
"You want to play bass with our band, like bass like this? This could be interesting. OK, I didn't see this coming," McCartney said on stage during a concert at La Plata Stadium in Buenos Aires.
Leila surprised the musician and the crowd as she jammed along to the 1969 Beatle track, Get Back.
At one point the two even shared the mic with Leila taking lead on vocals.
Following the performance the crowd applauded the young bassist, while chanting "ole, ole, ole, Leila."