JASON Mraz had his first worldwide hit with I’m Yours – propelling him to international superstardom.

But now his thunder has been stolen on YouTube…by a small boy with a cheap ukelele.

The 32-year-old American sold more than three million copies of the feelgood song, shooting him to the top of charts all over the world.

But the Asian kid on YouTube – armed only with the tiny instrument – is hot on his heels.

His ludicrous cover version has already had 300,000 views – more than some versions of Mraz’s original – and is growing more popular by the day.

Nobody knows the infant’s name or how old he is. Hell, he can barely speak. But he can play.

And , for those who can’t even tell the difference, here’s the original: