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AMERICAN WORKHORSE

American Idol host Ryan Seacrest is officially the busiest guy in showbiz. Seacrest — whose daytime talk show launches next month — will replace radio icon Casey Kasem as host of American Top 40 beginning Jan. 10. Kasem, meanwhile, isn't going into retirement just yet. He'll continue hosting American Top 20 for adult contemporary stations around the country.

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American Idol host Ryan Seacrest is officially the busiest guy in showbiz. Seacrest — whose daytime talk show launches next month — will replace radio icon Casey Kasem as host of American Top 40 beginning Jan. 10. Kasem, meanwhile, isn't going into retirement just yet. He'll continue hosting American Top 20 for adult contemporary stations around the country.