Some of the biggest celebs in Hollywood are saving lives … of the four-legged variety. No longer is it popular to walk around with a pet shop-purchased pedigree dog by your side. These days, stars are heading to their local animal shelters to find their furry best friend. In the latest episode of "Celebrity Pet Project," one of pet adoption's biggest supporters, Mariel Hemingway, explains to host Theo Von how her mixed-breed cuties have changed her life. The actress is also featured in the new book, A Letter To My Dog, an ode to man's best friend that includes letters from owners including Oprah Winfrey and Hilary Duff.
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