The 20-year-old Clarksville, Iowa, native sang a "Rainbow Connection" duet with Kermit the Frog himself during the epic, two-hour Idol finale, but had an even more special performance moment with the season's runner-up, Caleb Lee Hutchinson, as the two performed a "Somewhere Over the Rainbow/What a Wonderful World" medley after announcing that they had begun dating during the season.
Maddie also has some experience in the music industry, having already released an album of original material, Songs From The Basement, in 2016.
This week, iHeartRadio host Bobby Bones mentored Barrett, Hutchinson and Poppe, whose set lists included an original single, a repeat of their favorite song performed so far and a hometown dedication, after going back to their respective hometowns to perform for their communities.
We will soon find out who will become the next American Idol. Each of the contestants took the stage for performances as well.
The next round was opened with Caleb singing "Don't Close Your Eyes" by Keith Whitley.
Lionel said his voice was "solid as a rock" and he owned the song.
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In the midst of all the songs and celebration, host Ryan Seacrest gathered all three on stage for the first elimination of the night.
The next performer was Gabby, who opted for Miranda Lambert's "Little Red Wagon".
The judges thought Caleb won Round 2, but Katy revealed she expected Gabby to have a "full-on takeover" in the third round. He channeled the beloved honesty of Johnny Cash on "Folsom Prison Blues" and also related to Cash in his coronation song called "Johnny Cash Heart". "I remember when her and her sister sang it was like wow these girls can sing".
Lionel said Caleb was right in his wheelhouse and was "so convincing", and Katy pointed out how fun the performance was.
Gabby then performed "Don't Stop Believin'" by Journey in honor of Pittsburgh, PA. Perry congratulated Barrett on her performance, saying it was the best version he had ever heard.
Maddie outlasted 23 other contestants to take the title. Poppe ended off the night with her rendition of "Landslide", which was a near pitch-perfect performance.