Fans of John Green's best-selling novel turned film, 'The Fault in Our Stars" are getting more excited each day. With the countless tweets, photos and videos taken from the set of the film, John Green is definitely showing fans that the film is turning out perfectly. In another video taken behind-the-scenes, John Green tests his lead stars Shailene Woodley and Ansel Elgort if they truly have read the book.

Even with the likes of "Divergent", "The Mortal Instruments" and "Fifty Shades of Grey," John Green's New York Times best-selling book, "The Fault in Our Stars" continues to be a novel loved by many. Since its' release in January of 2012, the sales continue to go up. Given a film is in the works, the novel is sure to be a hit once more following the release of the film adaptation.

Currently, the movie is being filmed in Pittsburgh which stars "Divergent" Shailene Woodley and Ansel Elgort. Woodley plays the female protagonist, Hazel Grace Lancaster while Elgort plays the part of the male lead, Augustus Waters. Nat Wolff also joins the cast as Isaac.

Being the author of the highly-acclaimed novel, John Green has made a point to make sure the film stars have read the book. In Green's latest video, fans will be delighted to know that both Ansel and Shailene have read the book and fallen in love with the characters. In fact, Shailene named "The Fault in Our Stars" as her top favourite book.

Aside from exposing the glamorous parts of the film, Green hilariously shows off the toilets or those on set called the Porta Potty.

"I've lived in an apartment smaller than this Porta Potty," says Green, adding "It has both a toilet and a urinal. It also smells great in here. It smells like angels and stardust. I am serious. This is a fancy Porta Potty."

Check out all the videos by John Green taken on set and click on the slideshow to see all the latest photos taken from "The Fault in Our Stars."

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