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Kellan Lutz

Kellan Lutz, Britney Spears, Hayden Panettiere and more celebs are teaming up for charity.

The trio and 10 other celebrities are cleaning out their closets for a cause, signing and contributing a pair of jeans each for Blue Jeans Go Green's "Great Denim Challenge."

The star-studded auction is designed to raise awareness about textile recycling and help the program collect its one-millionth piece of denim.

Blue Jeans Go Green has diverted over 600 tons of denim from landfills since 2006, and has utilized the denim for insulation for communities in need and public works projects across the U.S.

Fans of the stars can bid on their jeans at www.BlueJeansGoGreen.org until Nov. 3.