Is this an error?

So I was looking at Tyra Bank's profile a couple days ago and in the trivia section it mentioned she wore a size 9 shoe. In the very first episode of Hannah Montana, Miley mentions that she wears a 5. However, she was a few years younger than she is in this movie, and I know people grow. Is it possible her shoe size grew that much? I don't remember what size I wore when I was 13, but I want to be sure. It doesn't really matter, but it's going to bug me til I figure it out.

Remember that four fingers point back at you when you point one at me.