By now, we're all familiar with Hazel Grace, the beautiful, bold, cancer-stricken teenager from John Green's The Fault in Our Stars. What you might not know, though, is that her story is inspired by the true story of Esther Grace Earl, an equally bright girl and close friend of John Green who lost her battle to cancer at age 16. John Green has made it very clear that he's not telling Esther's story, but it's not hard to see how much of Esther shines through in Hazel. Before the movie hits theaters this week, we're introducing you to the amazing young life force that led to the incredible young-adult novel. Keep scrolling for a glimpse at the real-life Hazel.