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10/22/2012 at 06:00 PM ET

Hayden Panettiere and Kate Bosworth go way back. “I’ve known Kate since I was 10. We did Remember the Titans together,” Panettiere says in the exclusive clip above. “Kate is always somebody I looked up to as a big sister.”

Twelve years later, the two actresses are collaborating again, albeit for something a bit more fabulous: Panettiere is acting as a guest curator for Bosworth’s accessories site, JewelMint.

The Nashville star’s pick — appropriately called “The Hayden Necklace” — is a delicate whale-fin pendant with colorful crystal embellishments. The necklace retails for $ 29.99, with 50 percent of the proceeds benefiting The Whaleman Foundation, a charity that helps preserve and protect dolphins, whales and porpoises and their habitats.

It’s a cause that’s very close to Panettiere’s heart. “My passion [is] dolphins and whales and the ocean,” she says. “If the ocean goes, and these animals go, so will go life on earth. It’s really important and it impacts our lives.”

Watch the clip above to hear more about Panettiere’s experience with JewelMint. Tell us: Will you buy Hayden’s necklace?

–Jennifer Cress

PHOTOS: ACCESSORIZE LIKE A STAR — FOR LESS!

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