Busking violinist Justus Rivera, 13, became an internet sensation after Kutcher saw him playing on the streets in Philadelphia.

The actor was so amazed with the pint-sized musician’s skills, he made a video of his performance and posted it online.

Thanks to his popular Twitter updates, the video soon became an internet hit.

Rivera, who mixes classic songs with the likes of Michael Jackson’s Smooth Criminal, was invited on the Ellen talk show on US television and told of his chance encounter with Kutcher as he played to a crowd.

“I was doing the best I could and there was a bunch of people around me,” he said. “When the crowd started dying down some tall guy started walking towards me and I thought, ‘Oh man, that’s Ashton Kutcher!’

“He was walking towards me and I was so nervous. He was walking around and I’m like, ‘Oh my God, I think it’s him!’

“He stopped the video recording, I looked at him and he said, ‘Yeah’.”

The actor then gave him $20 before walking away and making him famous.

Kutcher posted a link to his video on his Twitter account, saying: “I came across this young man sawing on a fiddle and playing it hot.”

Rivera told Ellen DeGeneres he had stopped playing the violin after some lessons but then realised he could make money busking so he took it up again.

He now makes $200-$500 a day and is putting most of it towards going to university.

Source: Splash News