- The pop superstar and Top 3 Idol finalist performed “Firework,” the third single from Perry’s third studio album, Teenage Dream, in a show-stopping performance on Sunday evening’s finale.
- Marlene had sung the song at the tender age of nine, a clip of her performing as a child was shown prior to Marlene coming to the stage with Perry.
- Katy had surprised Marlene with the special invite to perform the song. ”Listen, I only save that song for inaugural events and Leah Marlene,” Katy told the finalist.
- The finale show was a star-studded event with other artists coming to the stage to perform including, Carrie Underwood, Gabby Barrett, James Arthur, Sara Bareilles, Michael Bublé, Deana Carter, Earth, Wind & Fire, Melissa Etheridge, Flo Rida, Ben Platt, Thomas Rhett, and Tai Verdes.
- .