Posted 1 hour agoSubscribe to BuzzFeed Daily NewsletterCaret Down19 Celebs Who Have Hidden Their Natural Hair Color So Well, You Probably Didn't Even Realize It Was FakeEmma Stone's red hair is iconic.by Michele BirdBuzzFeed ContributorFacebookPinterestLink If you've ever dyed your hair, you know how easily it can transform your entire look. And with celebs often changing their hair color for onscreen roles or just for the fun of it, you never know what they might be rocking the next time they're in the public eye. Here are the famous people who had hair colors that looked *so* realistic, you'd never know they weren't their natural tone: 1. To start, Emma Stone has always been famous for her signature red mane. Jamie Mccarthy / Getty Images But did you know she's naturally blonde? Dimitrios Kambouris / Getty Images for FLC Superbad producer Judd Apatow suggested Emma dye her hair red to differentiate from Jules, the film's other romantic lead. "Since then, she has cursed me because now people love her with red hair, and she's had to live with that for a lot of her adult life," he said. 2. Pop star Katy Perry is iconic for her jet-black hairstyle. Kevin Mazur / Getty Images for Katy Perry She's naturally blonde, but decided to dye her hair dark at 15. Eric McCandless / ABC via Getty Images 3. Jennifer Aniston's "bronde" hair gives a classic sun-kissed vibe. Jamie Mccarthy / Getty Images But if you rewind to the '90s, you'll know her as a brunette, which is actually her natural hair color. Ron Galella / Ron Galella Collection via Getty Images 4. Sophie Turner had red hair while working on Game of Thrones as Sansa Stark. Jon Kopaloff / FilmMagic / Getty Images She fooled everyone because she's actually a blonde IRL. Marc Piasecki / WireImage / Getty Images 5. Bella Thorne is known for her fiery red hair. Julien M. Hekimian / Getty Images for amfAR "A lot of people don't know I'm not actually a redhead," she said. "I'm a blonde. I dyed it for Big Love." Dimitrios Kambouris / WireImage / Getty Images 6. Angelina Jolie has been famous for her brunette hair throughout the years. Jon Furniss / Getty Images She's naturally dark blonde and had hair like this back in the '90s. Victor Malafronte / Getty Images Today, she's back to her roots and has a lighter mane once again. JB Lacroix / WireImage / Getty Images 7. Leighton Meester's copper hair is having a moment on the red carpet. River Callaway / WWD via Getty Images She's best known as Blair Waldorf on Gossip Girl, a character who famously had dark hair. Michael Tullberg / Getty Images But would you have ever guessed she's actually a blonde? Because she is. M. Caulfield / WireImage for MOTOROLA / Getty Images 8. Jennifer Lawrence dyed her hair dark for the first two movies of The Hunger Games franchise. Murray Close / Getty Images Traditionally, she's a blonde at heart. Swan Gallet / WWD via Getty Images 9. While Cole Sprouse was filming Riverdale, he dyed his hair dark to portray Jughead Jones. Todd Williamson / Getty Images for Entertainment Weekly He was born with sandy brown hair, which was seen in his earlier roles in Friends and The Suite Life of Zack and Cody. Bruce Glikas / FilmMagic / Getty Images 10. Kristen Stewart had dark brown hair for her role as Bella Swan in the Twilight Saga. Pascal Le Segretain / Getty Images Before that transformation, her hair was naturally dirty blonde. Richard Corkery / NY Daily News Archive via Getty Images 11. Mandy Moore has been a brunette for most of her acting career. Ron Batzdorff / NBC / NBCU Photo Bank via Getty Images But she considers her natural hair color to be "like dirty dishwater." Steve Granitz / WireImage / Getty Images 12. Kate Winslet dyed her hair a bold shade of red for her role as Rose in Titanic. CBS Photo Archive / Getty Images It took her "almost two years" to return to her natural blonde hair color once the film wrapped. Tony Harris - PA Images / PA Images via Getty Images 13. Amy Adams without red hair is hard to imagine. Amy Sussman / Getty Images But naturally, she is a strawberry blonde. You'd never know at first glance! Fairchild Archive / Penske Media via Getty Images 14. Mila Kunis bleached her hair for her role in Four Good Days. She even had dip-dyed ends that were teal! Vertical Entertainment But she ditched the blonde and eventually returned to her original brunette hair. COLE BURSTON / AFP via Getty Images 15. Selena Gomez went blonde in 2017, and she SLAYED. Axelle / Bauer-Griffin / FilmMagic / Getty Images But everyone still knows and loves her as a natural brunette. Stefanie Keenan / Getty Images for Rare Beauty 16. From black to neon green, Billie Eilish is no stranger to hair dye. Kevin Winter / Getty Images for iHeartRadio She's naturally blonde, which is the perfect base to try out all of these fun colors. Max Mumby / Indigo / Getty Images 17. Kelly Osbourne has never been afraid to change her hair, trying everything from blonde to lavender. Karwai Tang / WireImage / Getty Images