'American Idol' Winners Then & Now -- Whose Career Soared & Whose Plunged? (PHOTOS)

Back for its 15th and final season (yes, we said final!), American Idol has launched the careers of many megastars over the past 15 years, and it's also had its fair share of winners who have been all but forgotten. 

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To commemorate the show's impact on the music world, take a look back at all of the winners to date. Some have been pretty much busy every day since, while others not so much. Which one's success (or lack thereof) did you predict? 

 

Image via Katy Winn/Corbis

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