Mary McCartney/MPL CommunicationsPaul McCartney invited a young fan on stage to join him Tuesday night during a show at La Plata Stadium in Buenos Aires, Argentina.

Ten-year-old Leila Lacase was in the audience, holding up a sign asking Sir Paul to sign her teddy bear. McCartney went one step further and invited both Leila and her mom up on stage, reports Rolling Stone. He then lowered the mic so that she could add vocals to the Beatles classic “Get Back.” Leila responded with a casual “Muchas gracias” after their impromptu duet. The whole episode was captured on audience video posted to YouTube.

McCartney performs in Argentina again on Thursday night. His four-CD anthology, Pure McCartney, arrives on June 10.

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