LOS ANGELES – Since winning “American Idol” in 2005, country singer Carrie Underwood has become one of the show’s highest selling graduates, but she warned the latest crop of “Idol” finalists to “stay true” to their fans if they want to find similar success. … Former “Idol” contestant Jennifer Hudson, who won a Grammy this year for her debut album, will also star in a holiday special this season. Her program, “Home for the Holidays,” will air on December 14 on ABC. …

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