American Idol may be a show for amateurs, but judge Jennifer Lopez is a pro. J Lo showed them how it's done on Thursday night's series finale, performing her new single, "I Ain't Yo Mama," and her 1999 hit "Let's Get Loud." Not only did she kill it, but she barely broke a sweat! Check it out, plus get weepy watching a ton of past contestants return to open the show, and watch the moment the final winner was crowned.
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