From Carrie Underwood to Clay Aiken: 8 of the most jaw-dropping transformations from 'American Idol' finale

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'American Idol' Crowns a New Champion During Epic Series Finale

What a difference a few years and a personal stylist can make!

After 15 seasons, American Idol crowned its last winner on Thursday night's series finale, and boasted numerous performances from some of the show's most beloved alumni and the return of former judges Randy Jackson, Paula Abdul and Simon Cowell.

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Many of the show's contestants have gone on to make a name for themselves in the entertainment industry, and in doing so, have undergone fierce makeovers. Here are eight of the most shocking Idol transformations fans witnessed on last night's finale:

1. Kellie Picker: While her style has changed, Pickler's smile is brighter than ever! The country crooner was just 20 years old when she came in sixth place on the fifth season of Idol, and she leveraged time on the show into a full-fledged music career.

2. Justin Guarini: The curls were nowhere to be found when the season one runner-up showed up for the Idol finale. Now 37, Guarini exchanged his pleather styles and big hair that he was known for in 2002 for sleek suits and a clean-cut demeanor.

3. Carrie Underwood: One of the most successful Idol winners, Underwood has undergone a major makeover. The 33-year-old country music star rocked not one, but three sexy styles on the show's finale, which is a far cry from the conservative boot-cut jeans and plaid shirt she wore during one of her first performances on the show in 2006.

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4. Katharine McPhee: The runner-up in 2006 was McPhee, and since then, the 32-year-old actress/singer has gone from a brunette vixen to a blonde bombshell.

5. Clay Aiken: The 2003 runner-up put his music on the back burner to pursue politics, and that was evident when he performed on the finale in a traditional suit.

6. Ace Young: The heartthrob of Idol's 2006 season looked just as handsome at 35 with his short hair, and was just as eager to perform on the Idol stage as he was over a decade ago.

7. Jordin Sparks: The 2007 winner put on a sexy display when she hit the red carpet in a midriff blouse on Thursday night. The 26-year-old singer has been working on her fitness since her big win on Idol, and it certainly shows.

8. Simon Cowell, Randy Jackson and Paula Abdul: The three original judges of the beloved series cleaned up nice for the grande finale. Cowell chose a suit over his trademark black T-shirt, while Abdul wore a classy (yet sassy) outfit. As for Jackson, he was significantly slimmer than when America was introduced to him in 2002.

See more photos from the epic "American Idol" series finale:

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From Carrie Underwood to Clay Aiken: 8 of the most jaw-dropping transformations from 'American Idol' finale
HOLLYWOOD, CALIFORNIA - APRIL 07: American Idol Season 15 winner Trent Harmon performs coronation song onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: American Idol Season 15 winner Trent Harmon (R), host Ryan Seacrest (L) and finalist La'Porsha Renae speak onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: American Idol Season 15 winner Trent Harmon (C) performs coronation song with cast of Season 15 onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: American Idol Season 15 winner Trent Harmon (R) and finalist La'Porsha Renae embrace onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
George Huff performs at the "American Idol" farewell season finale at the Dolby Theatre on Thursday, April 7, 2016, in Los Angeles. (Photo by Matt Sayles/Invision/AP)
Trent Harmon, winner of "American Idol" The Farewell Season celebrates with fellow contestants during the season finale at the Dolby Theatre on Thursday, April 7, 2016, in Los Angeles. (Photo by Matt Sayles/Invision/AP)
Ryan Seacrest, left, and Carrie Underwood speak at the "American Idol" farewell season finale at the Dolby Theatre on Thursday, April 7, 2016, in Los Angeles. (Photo by Matt Sayles/Invision/AP)
Kris Allen performs at the "American Idol" farewell season finale at the Dolby Theatre on Thursday, April 7, 2016, in Los Angeles. (Photo by Matt Sayles/Invision/AP)
William Hung performs at the "American Idol" farewell season finale at the Dolby Theatre on Thursday, April 7, 2016, in Los Angeles. (Photo by Matt Sayles/Invision/AP)
HOLLYWOOD, CALIFORNIA - APRIL 07: (L-R) Season 1 judges Paula Abdul and Randy Jackson and the cast of Season 15 present host Ryan Seacrest with a gift onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CA - APRIL 7: Judge Jennifer Lopez performs onstage at FOX's American Idol Season 15 Finale on April 7, 2016 at the Dolby Theatre in Hollywood, California. (Photo by Ray Mickshaw/FOX via Getty Images)
Phillip Phillips performs at the "American Idol" farewell season finale at the Dolby Theatre on Thursday, April 7, 2016, in Los Angeles. (Photo by Matt Sayles/Invision/AP)
HOLLYWOOD, CALIFORNIA - APRIL 07: Recording artists Keith Urban (L) and Carrie Underwood perform onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: Host Ryan Seacrest (L) and Brian Dunkleman speak onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: (L-R) Recording artists Harry Connick, Jr., Jennifer Lopez and Keith Urban enter onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: Actress/singer Jennifer Lopez greets fans onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: Singers Trent Harmon (L) and La'Porsha Renae perform onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: Host Ryan Seacrest (L) and Brian Dunkleman speak onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: Singers Trent Harmon (L) and La'Porsha Renae perform onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: Fans attend FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: (L-R) Recording artists Pia Toscano, Kimberley Locke, Allison Iraheta, Jordin Sparks and Tamyra Gray perform onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: (L-R) Recording artists Jordin Sparks, Allison Iraheta, Tamyra Gray and Justin Guarini perform onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: Recording artist Jordin Sparks performs onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: Recording artist Pia Toscano performs onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: Recording artist Jordin Sparks performs onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: Recording artists Justin Guarini (R) and Jordin Sparks perform onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: Recording artist Colton Dixon performs onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: Recording artists Kimberley Locke (L) and Allison Iraheta perform onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: Recording artist Chris Daughtry performs onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: Singer Bo Bice performs onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: (L-R) Recording artists Caleb Johnson, Constantine Maroulis, Chris Daughtry, James Durbin and Bo Bice perform onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: Recording artists Constantine Maroulis (L) and James Durbin perform onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: Recording artist James Durbin performs onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: (L-R) Recording artists Bucky Covington, Ace Young, Constantine Maroulis and Scotty McCreery perform onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: Recording artist Jessica Sanchez performs onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: Singer Carly Smithson performs onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: Recording artists Katharine McPhee (L) and Casey James perform onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CA - APRIL 7: Judge Jennifer Lopez performs onstage at FOX's American Idol Season 15 Finale on April 7, 2016 at the Dolby Theatre in Hollywood, California. (Photo by Ray Mickshaw/FOX via Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: Singers Marley Fletcher (L) and Harry Connick, Jr. perform onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: Recording artist Fantasia performs onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: Singer Candice Glover performs onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: Host Ryan Seacrest speaks in the audience during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: American Idol Season 15 winner Trent Harmon (R), host Ryan Seacrest (L) and finalist La'Porsha Renae speak onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: American Idol Season 15 winner Trent Harmon (R), host Ryan Seacrest (L) and finalist La'Porsha Renae speak onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
HOLLYWOOD, CALIFORNIA - APRIL 07: Recording artists Keith Urban (L) and Carrie Underwood perform onstage during FOX's 'American Idol' Finale For The Farewell Season at Dolby Theatre on April 7, 2016 in Hollywood, California. at Dolby Theatre on April 7, 2016 in Hollywood, California. (Photo by Kevork Djansezian/Getty Images)
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