'American Idol': 8 stars surprisingly rejected by the competition series

"American Idol" has launched the careers of some of today's biggest stars in music.

Kelly Clarkson and Carrie Underwood are the show's most notable winners, but even the likes of Jennifer Hudson and Chris Daughtry, who didn't come in first place during their time on the series, made it big after appearing on the show.

While the show has churned out superstars for 17 seasons now, there have been a few who slipped through the cracks over the years.

NEIL YOUNG CALLS TRUMP 'DISGRACE TO MY COUNTRY' IN OPEN LETTER

Here's a look at eight stars who were rejected by "American Idol":

Maren Morris

Maren Morris. (Photo by Taylor Hill/Getty Images)

Maren Morris. (Photo by Taylor Hill/Getty Images)

Even though she's ruling the country charts these days, Maren Morris wasn't always on top of everyone's playlists.

GLEN CAMPBELL'S WIDOW SAYS MUSEUM BROUGHT 'SOME PURPOSE OUT OF THE HORRIBLE TIME WE'D JUST GONE THROUGH'

In 2016, the "My Church" crooner, 29, revealed to Rolling Stone that she was rejected from both "American Idol" and "The Voice."

Bebe Rexha

Bebe Rexha. (Photo by Amy Sussman/Getty Images)

Bebe Rexha. (Photo by Amy Sussman/Getty Images)

Bebe Rexha had a full-circle moment in 2018 when she joined "American Idol" as a mentor.

ELTON JOHN FORCED TO CANCEL 2 MORE SHOWS IN NEW ZEALAND DUE TO PNEUMONIA

"10 years ago my mother and I waited 10 hours in line to audition for American Idol," Rexha, 30, tweeted. "I didn’t make it through. This year I’m mentoring!"

Kane Brown

Kane Brown. (Photo by Jeff Kravitz/AMA2019/FilmMagic for dcp)

Kane Brown. (Photo by Jeff Kravitz/AMA2019/FilmMagic for dcp)

After seeing his longtime pal Lauren Alaina succeed on the show, Kane Brown thought he'd give it a shot but ultimately didn't make it.

ADELE APPEARS TO REVEAL WHEN FANS CAN 'EXPECT' HER NEXT ALBUM DURING PERFORMANCE AT BEST FRIEND'S WEDDING

Brown, 26, recounted the experience in an interview with Billboard, where he remembered being told the show "didn't need another Scotty McCreery."

Colbie Caillat

Colbie Caillat. (Photo by Taylor Hill/Getty Images)

Colbie Caillat. (Photo by Taylor Hill/Getty Images)

As popular as her song "Bubbly" became, it's hard to imagine "American Idol" turning Colbie Caillat away, but they did -- twice.

OZZY OSBOURNE CANCELS NORTH AMERICAN TOUR TO 'RECOVER' FROM 'HEALTH ISSUES,' WILL RECEIVE TREATMENT IN EUROPE

The songstress, 34, was rejected both times she auditioned, performing her hit pop tune during her second go-round (per the Daily News).

Alex & Sierra

Alex Kinsey and Sierra Deaton of Alex & Sierra. (Photo by Jason LaVeris/FilmMagic)

Alex Kinsey and Sierra Deaton of Alex & Sierra. (Photo by Jason LaVeris/FilmMagic)

Famous for winning "The X-Factor," Alex & Sierra first auditioned for "American Idol" separately.

MUSICIAN BEN FOLDS ON FORGING UNION BETWEEN CLASSICAL MUSIC AND ROCK: 'THEY EACH HAVE SOMETHING TO OFFER THE OTHER'

While Alex Kinsey, 28, made it into the very early stages of the competition, Sierra Deaton, 29, was rejected from the get-go, according to Rolling Stone.

Chrissy Metz

Chriss Metz.

Chriss Metz. (Reuters)

Before making it big on "This Is Us," Chrissy Metz auditioned for "American Idol" with "Heavy" from "Dreamgirls," she revealed in a SiriusXM interview.

KOBE BRYANT RECEIVES TRIBUTE FROM QUEEN LATIFAH AT NBA ALL-STAR GAME

Metz, 39, has gone on to sing on "This Is Us" and performed the Oscar-nominated "I'm Standing With You" from the film "Breakthrough."

Naya Rivera

Naya Rivera. (Photo by Joe Scarnici/Getty Images for March Of Dimes)

Naya Rivera. (Photo by Joe Scarnici/Getty Images for March Of Dimes)

"American Idol" may have rejected Naya Rivera, but she still got to show off her voice on "Glee."

THE PRETENDERS' CHRISSIE HYNDE REACTS TO TRUMP HONORING RUSH LIMBAUGH, SAYS HER DAD WOULD'VE BEEN 'DELIGHTED'

As she revealed on "The Talk," she was denied after singing "Emotion" by the Bee Gees. The same song would eventually land Rivera, 33, a role in the musical comedy show.

Amber Riley

Amber Riley. (Photo by Amy Sussman/Getty Images)

Amber Riley. (Photo by Amy Sussman/Getty Images)

Another "Glee" alum shot down by "American Idol" was Amber Riley. She revealed on "The Wendy Williams Show" that she auditioned as a teen.

JUSTIN TIMBERLAKE RECALLS DODGING BOTTLES OF URINE FROM HOSTILE CROWD WHILE PERFORMING WITH THE ROLLING STONES

"You know what? I still work on FOX and I get paid," said Riley, 34. Since then, she has recorded music and appeared in several musicals.