Mia stated on Late Night with Seth Meyers (2014) that her real birthday is not October 14, 1989, as shown all over the Internet. It is her "fake" birthday and when people contact her on this date, she knows that they do not know her.
I just wanted to try a different type of performance - ballet is more an image of perfection, and film can show a grittier side. Sometimes it's the more realistic topic of real life that really intrigues me.