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Earth Day Gets 'Avatar'-ized

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April 23 2010, Published 6:30 a.m. ET

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James Cameron and some of the Avatar cast celebrated Earth day yesterday in a big way. The day began at the Avatar Earth Day tree planting celebration held at the Twentieth Century Fox Studio Lot in L.A. The Avatar evening celebration brought out some A-listers in celebration of the 40th Anniversary of Earth Day. The red carpet was complete with Avatars who greeted guests!

Last night also seemed to be a showcase for young hot celebs sporting new, shorter 'dos.

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Adrien Grenier and Hayden Panettiere had brand new hair cuts!

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Hayden proudly wore her new, drastic short look with boxing boyfriend Wladimir Klitschko at her side!

Hayden is a big advocate for environmentally friendly practices, and worked on the Oscar-winning documentary The Cove.

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