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Shailene Woodley

Alberto E. Rodriguez/Getty Images

Shailene Woodleyis going green by going yellow.

We recently chatted with the Secret Life of the American Teenager starlet to get her advice for how to be more eco-friendly in your everyday life.

"I think a really good one is, if you live by yourself, if it's yellow, let it mellow," Woodley told us. "I think that's the best advice you could give. Every toilet, every time you flush it you waste up to like four gallons of water depending on your toilet."

As with her green bathroom behavior, Woodley advises that it's the little things you do that count the most.

The 20-year-old dished, "I think it's important to find a passion to life and to stick to it, because I think there's a lot of things in this world that need to be changed, and the only way that's going to happen is if every individual finds the thing that they are passionate about and dedicates themselves to it. As long as it creates positive shift."