'American Idol': 20 Best, Worst and WTF Moments

From Adam Lambert being robbed to William Hung doing his thing, it's been a wild ride for the past 15 seasons

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Best: Katy Perry Stumps for Adam Lambert, Season 8

Speaking of Adam Lambert… Katy Perry went to bat for the contestant before the big Season 8 American Idol finale by wearing a cape with his name on it during her performance of "Waking Up in Vegas." While the show attempted to censor the image out of any videos that surfaced, Perry had already made her point. Despite the high-profile endorsement, though, Lambert lost to Kris Allen in what some thought was a backlash against his perceived sexuality. But the runner-up got the last laugh by landing the cover of Rolling Stone just two weeks later to announce he was indeed gay — and six years after that, he was named the top-earning Idol alum of 2015 by Forbes. So, take that, haters.

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