- Many celebrities grow and change as their careers go on.
- But some begin to look dramatically different as they get more and more famous.
- These 19 stars have had some of the most notable beauty, style, or hair transformations since the beginning of their careers.
- Many are former child stars like Miley Cyrus, Ariana Grande, and Cole Sprouse.
The nature of being a celebrity is to grow and thrive in the public eye. Many, especially those who found fame at a young age, change as their careers go on.
But some stars look dramatically different from when they first entered the spotlight – especially as that spotlight has gotten dramatically brighter.
These 19 in particular have had some of the most notable beauty, style, or hair transformations.
Khloe Kardashian has spoken openly about her weight loss.
Khloe Kardashian rose to fame alongside her family members when “Keeping Up With the Kardashians” first aired on E! in 2007. At the time, the brunette would often refer to herself as the “fat, funny one.”
"I never looked at myself as the fat sister," she told Complex in 2015. "Sometimes I would beat people to the punch and say, 'Oh I'm the fat, funny one,' because that's what people would say about me."
Kardashian said she began using exercise as a "coping mechanism" when her marriage fell apart in 2013. Now, the youngest of the Kardashian trio has built her own individual brand by pivoting to a healthy, fitness-focused lifestyle - namely with her book "Strong Looks Better Naked" and her show "Revenge Body."
Along with her body transformation, the mom of one has also adopted blonde hair and a more monochromatic, trendy wardrobe.
Ariana Grande is rarely seen anymore without her signature ponytail.
Ariana Grande rose to prominence as the bubbly, red-headed Cat Valentine on Nickelodeon's "Victorious." She didn't wear a wig, which means that Grande spent the first few years of fame bleaching and dying her hair every other week.
As her music career took off, Grande ditched the artificial color and began wearing her hair in a sleek, high ponytail, which has now become her signature look.
The 26-year-old pop star has also gotten at least 43 tattoos and embraced a more mature style.
Read more: 52 photos that show Ariana Grande's dramatic style evolution
Kristen Stewart has truly come into her own.
Although she began acting when she was very young, Kristen Stewart exploded when she was cast in the starring role of the "Twilight" series as the beautiful brunette, Bella Swan.
Read more: THEN AND NOW: The cast of the 'Twilight' saga
These days, Stewart is rocking a much edgier hairstyle and plenty of high-fashion outfits as one of the faces of Chanel. She has also become a vocal member of the LGBTQ community and uses her platform to preach acceptance.
Kesha now favors a much brighter look.
Kesha's earlier image - as hard-partying, glitter-loving Ke$ha - was formulated in conjunction with her debut album, "Animal." But it may not have been what the singer herself truly wanted.
"Something that was always told to me is: 'You're fun. We're going to capitalize on that,'" Kesha told the New York Times in 2016. One part of the "we" used here is Dr. Luke, Kesha's producer, whom she has sued for sexual, physical, and emotional abuse.
"I was like, 'I am fun, but I'm a lot of other things,'" she continued. "But Luke's like: 'No, you're fun. That's all you are for your first record.'"
For Kesha's comeback single "Praying" in 2017, she embraced a much more colorful aura, complete with Nashville-inspired vintage, a butterfly veil, a lime-green Gucci jacket, and angel wings.
"I mean, she loves rainbows," Kesha's stylist, Samantha Burkhart, told Racked. "That's kind of what she identifies with on a core level - literally being a rainbow."
At the beginning of her career, Nicole Kidman was known for her bright red curls.
Nicole Kidman made her film debut at age 16 and enjoyed mild success in different Australian films and TV shows. By the early '90s, her claim to fame was mainly for starring in a couple of films opposite her boyfriend and now ex-husband Tom Cruise.
More recently, Kidman won an Emmy for her role as Celeste Wright on HBO's "Big Little Lies," and was nominated for basically every award for her performance in 2016's "Lion."
Miley Cyrus now boasts blonde hair and a ton of tattoos.
Miley Cyrus' first major role as Hannah Montana is well-known for launching her into superstardom. Her transition out of that Disney Channel image, however, is even more so.
After a few major haircuts, an infamous VMAs performance, and an album all about her numerous dead pets, Cyrus definitely seems to have hit her stride. Stylistically, she seems more comfortable than ever in long, blonde hair and risky-yet-sophisticated looks that showcase her collection of ink.
Read more: 61 photos that show how Miley Cyrus' style has evolved through the years
Willow and Jaden Smith have become fashionable risk-takers.
Willow Smith and Jaden Smith have been in the spotlight since they were children, thanks to their famous parents. They each dabbled in their own projects at an early age: The former with her hit single "Whip My Hair" and the latter with a starring role alongside his father in "The Pursuit of Happyness."
These days, the Smith siblings are taking on the fashion world, making music, and opening up about their family dynamic on Jada Pinkett Smith's "Red Table Talk."
Justin Timberlake ditched his frosted tips.
Justin Timberlake has been in the spotlight since starring on "The Mickey Mouse Club" reboot at age 12, but he became a '90s icon as the blonde, curly-haired member of the beloved boy band *NSYNC.
But after the band announced a "temporary hiatus" in 2002, Timberlake presented a fresh new look on the cover of his debut solo album "Justified."
Now 38 years old, Timberlake has an impressive resume: 10 Grammys, multiple starring film roles, a 3-year-old son, and a long career full of triumphs, controversies, and iconic moments.
Read more: The fabulous life of Justin Timberlake - from Mickey Mouse Club to *NSYNC, movies, and solo stardom
Christina Aguilera's sense of style has transformed.
Christina Aguilera is another Mickey Mouse Club alum, and the powerful vocalist dominated pop charts in the late '90s and early 2000s. As an emblem of early 2000s fashion, Aguilera was well known for taking risks with her wardrobe, favoring dark eye makeup, belly shirts, and colorful streaks in her hair.
More recently, Aguilera has been known to tone down her style and even went completely bare-faced on the cover of Paper magazine last year.
The five-time Grammy winner recently announced a coveted Las Vegas residency, called "Christina Aguilera: The Xperience."
Justin Bieber has gone through a number of style transformations.
Justin Bieber was signed to Island Def Jam at just 14 years old - so it makes sense that his look has transformed as he has grown in the public eye.
While his early fashion choices included many purple cardigans and chunky sneakers, these days, Bieber can usually be spotted gallivanting with his wife wearing trendy outfits and pieces from his own clothing line. And that's not to mention that the pop star had an unfortunate dreadlocks phase, recently released his own clothing brand, and his upper body has been covered with a variety of tattoos.
Kylie Jenner said her current look is thanks to makeup and "fillers."
Plastic surgery reports and assumptions have followed the entire Kardashian-Jenner clan for the past decade. But since Kylie Jenner was just 10 years old when her family's hit reality show aired, she has changed in the public eye more than any of her family members.
Each sister, from Kim Kardashian West to Kendall Jenner, has repeatedly denied getting any work done - except for Kylie, who admitted to lip injections in 2015 to achieve her now-famous pout.
She recently credited fillers for her transformation in an interview with Paper magazine.
"People think I fully went under the knife and completely reconstructed my face, which is completely false," Jenner said. "I'm terrified! I would never. They don't understand what good hair and makeup and, like, fillers, can really do ... It's fillers. I'm not denying that."
Lady Gaga has recently embraced a less theatrical red carpet style.
During her astronomical rise to fame, Lady Gaga was rarely seen without her classic blonde bangs and an elaborate outfit. Who could forget the infamous meat dress?
These days, Gaga has taken awards season by storm in a very different way: By dressing in various mature, glittering, and regal red carpet looks. The "A Star is Born" actress recently took home three Grammys and is up for best actress at the 2019 Oscars.
Bella Thorne has gone in the exact opposite direction.
Bella Thorne was just 13 years old when she was cast as CeCe Jones in Disney Channel's dance series "Shake It Up."
In the years since, Thorne has starred in various romantic comedies like "The DUFF" and "Midnight Sun," and has repeatedly made headlines thanks to her unique and daring sense of style.
Zendaya has evolved into a fashion icon.
Zendaya, Thorne's co-star on "Shake It Up," similarly rose to fame at an extremely young age.
Now, still just 22 years old, Zendaya stars in Marvel's current "Spider-Man" film series, asserts herself as a staunch feminist, and consistently earns her place on best-dressed lists.
Read more: RANKED: The 45 young stars who will one day rule Hollywood
Keri Russell rocked a much shorter haircut in the late '90s.
While Keri Russell had a number of smaller roles in the early '90s, she rose to fame later in the decade as a star on the popular television series "Felicity." She's now renowned for her Emmy-nominated role on "The Americans."
Adele ditched her bangs for a more timeless hairstyle.
The first in Adele's trilogy of albums named after her age, "19," was released in January 2008. The cover art prominently featured the singer's recognizable brunette bangs.
By the time "25" won album of the year at the 2017 Grammys, Adele had chopped, lightened, and re-styled her hair. Though the change may seem small on paper, it completely transformed her look.
Katy Perry is rocking a shorter, blonder haircut these days.
Katheryn Elizabeth Hudson has been in the spotlight since releasing her debut album, "Katy Hudson," in 2001.
But her face wasn't plastered on billboards and TV screens until she adopted the stage name Katy Perry and released the smash single "I Kissed a Girl" in 2008.
The Grammy-nominated singer has since claimed nine No. 1 songs, headlined the Super Bowl halftime show, and, most recently, celebrated her engagement to Orlando Bloom.
Cole Sprouse has grown out of his boyish blond days into a dark-haired, suave young adult.
Dylan and Cole Sprouse were booking roles from a very early age. Most notably, the twins starred on Disney Channel in the titular roles of "The Suite Life of Zack & Cody" and its spinoff "The Suite Life on Deck."
Cole Sprouse now stars on The CW's hit show "Riverdale," sporting a much darker hairstyle and more refined look.