The 22-year-old actress revealed what it was like working alongside teens battling cancer while she filmed the movie, telling People it made her "want to wake up every single day and be the best version of me."
"A lot of that has to do with Fault and meeting these 16- or 18-year-olds who had a week to live or passed away while we were filming," she continued. "Doing that film taught me that there is no room for fear. Zero."
In the film adaptation of John Green's successful novel, Shailene plays cancer patient Hazel Grace Lancaster, who meets the love of her life in a cancer support group.
Although Shailene learned a lot from the cancer patients, she also felt a little guilty making the film with them, telling the mag, "There is just no way to justify life. Why am I here making this couple-million-dollar movie and eating a nice meal with [my costar] Laura Dern, and at the table right next to us is a 16-year-old boy with a tumor growing out of his head?"
From that experience though, she learned to embrace life even more.
"Are we going to spend life wallowing, or are we going to be stoked and laugh? We have no idea [when we will die], so it is just about living life to the fullest," she said. "Laughing feels so good. I tell you, all my older friends laugh a lot and have no wrinkles. That is the secret to good skin, I swear. Everyone has this big thing about chemicals and facials, but it is just laughter."
Just one more reason why we love Shailene.