Some big names turned out for the Greenzys Family Earth Day Celebration at the RonRobinson store in Hollywood.
The event, co-sponsored by the Environmental Media Association, raised awareness about the importance of preservation and conservation of the planet.
Check out the gallery of A-list stars who supported the cause:
We talked to the stars in attendance and the offered tips on going green.
Longtime environmentalist and activist Ed Begley Jr. recommends people do the "cheap and easy" stuff, including riding bikes, taking public transportation, and gardening at home.
James van der Beek and his wife Kimberly Brook go to the farmers market, buy organic produce, and make daughter Olivia's baby food. Kimberly also wears a lot of vintage clothing.
Reality TV star Kristin Cavallari regularly recycles.
"Shake It Up" star Roshon Fegan limits his water usage and uses enivronmental-friendly bamboo ware.
Tell us what your favorite green activity is in the comments below!
