Michelle Obama, Brad Pitt, Jessica Alba

The biggest stars in Hollywood are giving back to the environment in big ways.

Whether they recycle on a daily basis, shop for organic foods or purchase green property, several celebrities continue to show how much they care about the world around them.

From actors like Brad Pitt and Jessica Alba to TV stars including Nicole Richie and Busy Philipps, stars have been stepping up to help the planet with simple tips we at home can follow.

In honor of NBCU Earth Week, check out the Hollywood stars going green!

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