After the legendary win, Harmon took to Instagram to address his fans.
"I worked hard, but ya'll did this," he said in a video posted online. "All I did was show up and sing ... and I love you."
Here are 5 things to know about the grateful winner, who is the very last "American Idol."
1 - Check Out His First Single "Falling"
Here's the "Idol" version.
2 - He's From the South
Harmon, 25, is from Amory, Mississippi, and he first became interested in music at age 5, according to the American Idol Wikia. He attended the University of Arkansas at Monticello and tried out for other singing shows before hitting it big on "Idol."
3 - His Fellow Contestant Dalton Is His "Best Friend"
Contestants get close on "Idol," but Trent and Dalton Rapattoni really epitomize camaraderie. They post tons of pictures together and one is even captioned, "That's my best friend."
Harmon also supported the heck out of Rapattoni, even though he needed America's vote as well.
"Thankful for this crazy, crazy, man's friendship."
4 - He's Passionate About His Faith
This past Easter, Harmon shared a photo from church and wrote, "Happy Easter, y'all. Have fun today; remember your purpose, where you've been, who's you are and where you want to go."
He even shares inspiring quotes from others.
"Hope you guys are having a very solid Tuesday. Luh you bunches," he wrote last month.
5 - He's a Solid Sports Fan
Fans have sent him lots of St. Louis Cardinals gear and his reaction was, "Holy cow, you guys!!"
He also posted a lot of pics enjoying NASCAR.