Olympic child singing star revealed as fake - Yahoo! News 

So does it really surprise anyone that China didn’t use the actual singer for the opening ceremonies because of the uneven teeth. Lin Miaoke (below left) was shown during the performance, while it was Yang Peiyi (below right) who’s voice was being played.

The delicateness of how it was put:

“We have a responsibility to face the audience of the whole country, and to be open with this explanation,” he said. “We should all understand it like this: it is a question of the national interest. It is a question of the image of our national music, our national culture.