Top 5 Most Successful 'American Idols' of All-Time
After becoming the first country artist to wear the Idol crown, Carrie Underwood has flown off the shelves: her 12.4 million U.S. album sales prevails over all the show's graduates, according to Nielsen SoundScan. After 11 No. 1 hits on the Country charts, Underwood isn't slow down — her fourth album is due out May 1.
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