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Martin Sheen slept on a sidewalk in Washington to prepare for one of his roles and now he has a star on a sidewalk in Hollywood. Sheen's sons, Emelio Estevez and Charlie Sheen, were in the crowd Friday when the actor was honored with a star on the Hollywood Walk of Fame. Sheen, 48, said he wanted to dedicate his star, the 1,897th on the Walk of Fame, to the homeless. Sheen's recent roles have included a portrayal of Washington homeless advocate Mitch Snyder but he also stays busy campaigning for disarmament.