VIDEO: Demi Lovato performs 'Really Don't Care' and 'Neon Lights' on American Idol 2014

Demi Lovato performed 'Really Don't Care' and "Neon Lights' on the American Idol 2014 Finale.

She made good on her promise to return to the show after she dropped by on Idol as a surprise guest mentor.

She sang 'Really Don't Care' solo then was joined by the Idol girls for 'Neon Lights'. I think she really schooled them in the vocal on that one. Demi is really good! Glad to see her back on the Idol stage. She was my favorite judge on The X Factor USA. Too bad that was canceled.

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