"The Fault in Our Stars" fans finally have their cast for the film but not everyone is happy with the results. Fan made posters featuring their own celebrity bets for Augustus Waters and Hazel Grace Lancaster continues to flood social networking sites. Check out all the best fan-made "The Fault in Our Stars" movie posters here.

Director Josh Boone and Author John Green were ecstatic to share the news of their cast for the film "The Fault in Our Stars." Ansel Elgort and Shailene Woodley nabbed the lead roles of Augustus Waters and Hazel Grace Lancaster respectively. However, some fans were the least bit impressed.

Yet, leave it to John Green to end the debate about the casting on his Tumblr account. One fan questioned Green's choices to which answered flawlessly. The conversation posted on Tumblr is as follows.

"John, I'm quite disappointed with who you've casted for Hazel and Augustus for TFiOS movie. Could you please inform me why you chose this actor and actress for such important characters? If I understand why they were casted, I may like them gradually," stated the Tumblr user.

John Green's lengthy answer is as follows:

"1. Shailene Woodley is a brilliant actress and Golden Globe nominee. I cannot think of any 18-year-old actress who has received the kind of critical acclaim that she has (she also won an Independent Spirit Award)."

"She auditioned for The Fault in Our Stars not because she needs the part (I mean, she's in the new Spider Man movie, for God's sakes) but because she loves the book. Her depth of understanding were immediately obvious in the audition and for me there could be no one else to play Hazel. (There were a bunch of really good auditions, but Shailene just understood Hazel as I imagined her.)"

"I am not particularly concerned with physical looks; Hollywood can fix that stuff. (Remember when Nicole Kidman became Virginia Woolf?) I'm concerned with whether she can embody the voice and experience and life of Hazel. She can."

"2. Ansel Elgort is also a huge fan of TFiOS (it is, in fact, his favorite book). He was a high school basketball player who also happens to be a very intellectual guy. Most importantly, when he auditioned, he became Augustus. Watching him audition with Shailene, he was just Gus and she was just Hazel. He understood Gus, and clearly had a very deep and thoughtful relationship with the book. Honestly, I'm a bit confused as to how you can dislike an actor whose work you have definitionally never seen, since his first movie isn't out yet."

"3. Novelists do not cast movies, so these were not my decisions (although I did have a lot of input). But I'm defending them because I think they're both perfect for their parts (and I'd tell you if I felt otherwise)."

"4. There seems to be some concern that Ansel and Shailene are playing siblings in a different movie. I guess I can understand that, but they're actors. They can play different roles. They'll look different and act different and be different. I mean, no one watched Silver Linings Playbook and thought, "When did Katniss move to the suburbs of Philadelphia?""

"If the movie works, you'll sit down in the theater and you won't say, "Oh look it's Shailene Woodley," or, "Oh, look, it's Tris from Divergent." You'll say, "Holy wow Hazel Grace.""

Hopefully, John Green's answer is enough to calm enraged fans. For now, check out the slideshow to see the best fan-made "Fault in Our Stars" posters spread over social networking sites.

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