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'Alvin and the Chipmunks: Chip-Wrecked' -- 1 1/2 stars

G; 1:27 running time A Sarah Palin joke? A Charlie Sheen wisecrack? Is this a Chipmunks movie or a Letterman monologue? As current as a Lady Gaga cover, if not quite as relevant, Alvin and the Chipmunks "Munk Up" for their third digitally animated turn on the big screen ¿ "Alvin and th