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"He's sort of like my brother in real life."

That's how Shailene Woodley describes her Divergent costar Ansel Elgort with whom she's teaming up again in the hotly anticipated young-adult film, The Fault in Our Stars.

The 22-year-old actress attributes the "amazing" transition the pair made—going from the sci-fi flick currently holding the No. 1 spot at the box office to the more somber movie coming out this summer—to the friendship they developed on the Divergent set.

Shailene Woodley

Jamie McCarthy/Getty Images

Delving further into how their cozy relationship made filming easy the brunette beauty says, "Naturally, we get along so well…so to go from a movie where we were so comfortable with each other to a movie where vulnerable action was necessary, it was nice to have somebody that we could just really rest in each other's arms and not feel like we had to get to know each other."

Adding, "We got to skip that phase."

And being accessible to each other was essential to their roles, according to Woodley. "We really wanted to make sure we gave justice to the characters, because the way that they were described in the book was so sensitive and so vulnerable and yet powerful at the same time."

The Fault in Our Stars is based on the sweet, sad and funny John Green novel about two teenagers who meet and fall in love at a cancer support group. The outspoken star says the premise is even richer than that, stating, "It's a cancer book that's not about cancer."