Judge Jennifer Lopez performs onstage at FOX's American Idol Season 15 Finale on April 7, 2016 at the Dolby Theatre in Hollywood, California.
Credit: Ray Mickshaw/FOX/Getty Images

After 15 roller coaster seasons, Fox's American Idol came to a bittersweet end Thursday night. For its final act, the beloved reality singing competition packed on the nostalgia with a parade of performances from former contestants—both familiar and forgotten. And somewhere along the way (after a special message from President Barack Obama and a surprise performance by William Hung) 25-year-old crooner Trent Harmon was crowned this season's winner.

Scroll down for our top can't-miss moments from the two-hour spectacle, including the world premiere of Jennifer Lopez's new single "Ain't Your Mama" and a killer performance from original American Idol Kelly Clarkson.

Lopez's action-packed performance of "Ain't Your Mama" and "Let's Get Loud":

A very pregnant Clarkson's incredible pre-taped medley of past hits:

Jennifer Hudson, Fantasia Barrino, and LaToya London's soulful rendition of "Bridge Over Troubled Water" and "Remember the Music":

An emotional performance of "One Voice" from past and present Idol stars:

Trent Harmon's performance of his winning song "Falling" after being crowned the final American Idol:

Thanks for the great run, Idol. We'll certainly miss you.