Sir Paul McCartney performed 'Get Back' on stage with a 10-year-old fan at a concert in South America on Tuesday night (17.05.16).

Sir Paul McCartney and fan Leila on stage (c) Twitter

Sir Paul McCartney and fan Leila on stage (c) Twitter

The Beatles legend was performing at the La Plata Stadium in Buenos Aires, Argentina, when he spotted young Leila Lacase in the crowd with a sign that asked McCartney to sign her soft toy.

However, as soon as the legendary guitarist spotted the message he immediately had brought Leila and her mother up on stage.

The adorable girl then told Paul "I want to play bass with you", as the audience cheered loudly.

McCartney, 73, then asked: "Do you have your bass with you?"

And she said: "No."

Leila then pointed to a bass guitar on the stage, and McCartney said: "This could be interesting, I didn't see this coming."

He then asked her again: "You want to play bass with our band?"

She said: "Yes."

And then the rocker asked his fans: "What do you think?"

To which the crowd shouted "Yeah!"

Leila then played alongside McCartney, and impressed him with her musicianship.

He then asked the crowd: "What did you think of that?"

McCartney later took to his Twitter account on Wednesday (18.05.16) to share a photo of him on stage with her, captioning the shot: "10-year-old Leila has wish granted, playing bass with Paul on stage in Buenos Aires #OneOnOne (sic)"

The 'One On One Tour' has been extended with an extra eight dates in North America, which will conclude on August 17 in Cleveland, Ohio.

McCartney is also set to perform at mega festival Desert Tip in October along with The Rolling Stones, Bob Dylan, Neil Young, Roger Waters and The Who at Indio, California's Empire Polo Club in October.