I have a solution to your problem. Ok so first you have to find a person who can listen to a song and then play it on the piano wihtout music. Then you make them listen to Superstar Etude. After that you make them play it on the piano for you until they have it perfect. Then you have them teach it to you!

Just Kidding!!!

When I googled this, I found on a message board this answer regarding the sheet music for Superstar Etude:
These were written by Aaron Jay Kernis, who is one of the best young composers of today, in my opinion. He is very much alive, so needless to say his music cannot be posted here. Also, I have heard that these etudes are out of print, so it's all the harder to find them.
^^ http://www.pianostreet.com/smf/index.php/topic,28883.0.html

I'm sorry I couldn't be of more help. Good luck!
- Jennifer

[Edit:] (click more!)

I think I found something but I'm not sure if it'll work:
superstar etude #1
^^ It looks like it's available but I could not find links to purchase it. Either the music is only for rental or it just isn't available. I would suggest contacting Schirmer, the music publishing company, for more info if you're still interested.

I love that song. Maybe sheetmusicplus.com. Never mind. I just checked. They don't have it. Good luck finding it!