Found this on Flickr. Here's the link:
(The poster was not impressed, as you can probably tell.)
The summary, for now, is as follows:
"Barbie takes on a big challenge in her new movie—she plays two roles! In one, she’s a princess who feels bored and stifled by her very regimented life. In the other, she’s a rock star who is weary of touring, press junkets, and performances. When the girls decide to switch roles, they get a taste of how the other lives. Filled with memorable songs, this is sure to be a hit with Barbie fans!"
I... I don't know what to say.