Now playing: Tomboy.

Passed along by Setareh (thanks!):

A beautiful movie, and a beautiful actress... Laure is moving into a new neighborhood with her little sister Jeanne. Because she is in need of new friends and does not know anybody, Laure decides to dress and act as a boy. She becomes close to Lisa, who does not know her new best friend is not a boy.

It's been getting excellent reviews!