Comic-Con International 2015 - Day 1Willow Shields has had the pleasure of playing Jennifer Lawrence's sister since 2012, and while their real-life relationship definitely started off as more of a sister bond, it's developed into an even deeper relationship.

"At the beginning, it was like she was a big sister to me, and now it's become more like friends," she told Moviefone Contributing Editor Jessica Wedemeyer during this year's Comic-Con.

Shields also revealed that she thinks growing up around Lawrence definitely strengthened their friendship. "I feel like, as I've gotten older, we've kind of gotten closer in that sense -- and it's interesting to see how that changed too cause I guess in a certain sense you've seen the characters evolve into that a little bit as well -- and even though they're very much so sisters, they're also best friends. So I feel like we can definitely share that similarity."

The biggest benefit of being sister-friends with Lawrence? She has a plethora of wisdom to share. "She's been working in the industry since she was my age, and she's basically like, 'You've got to put a lot of hard work into it because at some point it will pay off.' It may take a while, but it will pay off -- and I'm actually so lucky to already at 15 have some of that work and some of that hard work pay off -- hugely, already! So that's pretty incredible."

And it's a good thing she has that advice to look to because she's spending her formative years in the spotlight. "It's one thing to grow up from 10 to 15, but it's another thing to grow up in the industry," she said. "I feel like I've tried to keep a little more normalcy in my life. I'm home-schooled, but I'm still very involved in schooling and things like that."

One way Shields makes herself feel like a regular teenager is surrounding herself with people who don't live in the Hollywood bubble. "I have friends who are not in the industry. It's hard to grow up in this kind of environment, but I feel like it's forced me to grow up quicker. I think it's incredible though. Not a lot of people can ay that they were playing a character in a huge franchise for years -- a really epic franchise. It's nothing but good things in general."

We think she's going to be great! "The Hunger Games: Mockingjay - Part 2" hits theaters November 20th.