Britney Spears
The singer sported her trendy new rainbow strands at the 2015 Teen Choice Awards.
Jon Kopaloff/FilmMagic
Rita Ora
The singer debuted her new light pink locks at the 2015 Teen Choice Awards.
Steve Granitz/WireImage
Kylie Jenner
Jenner recently shocked the Instagram world with her light blue locks.
Jon Kopaloff/FilmMagic
Hilary Duff
Hilary Duff's mermaid-inspired makeover came just in time for the spring season.
Splash News
January Jones
The Mad Men star unveiled a subtle pastel hue on Instagram.
Instagram/ januaryjones
Katy Perry
The singer hit the Grammys red carpet with a brand new lavender hue.
Steve Granitz/WireImage
Nicole Richie
Richie, who was partial to cool tones (lavender and blue) in 2014, started the New Year with more color experimentation, switching to a vibrant pink nearly a week after going turquoise.
Jon Kopaloff/FilmMagic
Bella Hadid
We were initially skeptical on whether or not the up-and-coming model's new baby pink hair was a wig. Seeing as Hadid credits iconic hair stylist Oribe as the master behind the look, we're inclined to believe it's the real deal!
Instagram/ bellahadid
Lena Dunham
Just two months after going blonde, Dunham went even bolder, captioning an Instagram snap, “Newly minted for the Canadian leg of the tour thanks to @tanneyb @rheannewhite.”
O'Neill/Todd G, PacificCoastNews
Kate Hudson
In honor of Breast Cancer Awareness Month, our July cover girl Kate Hudson, alongside mom Goldie Hawn and son Ryder, paid tribute to friends and family who have fought, or are currently batting the disease.
Instagram
Dascha Polanco
Polanco is the latest in line of celebs transitioning to the lilac hue, with the OITNB star opting for a daring gray-to-purple ombre.
Astrid Stawiarz/Getty Images
Helen Mirren
Although Mirren is no stranger to hair transformations, the actress, who has been a stickler to her platinum shade for years, surprised viewers of the BAFTAs with cotton candy pink hair.
Mark Cuthbert/Getty Images
Kesha
Rather than stick to one bold shade, Kesha went with several, hitting the 2014 VMA red carpet with My Little Pony-worthy hair.
C Flanigan/Getty Images
Raven Symone
Symone, who recently started a semester at San Francisco’s Academy of Art, marked the transition into student life with purple and green strands, Instagramming, “ My last Friday in la before I start my life as an #oncampus student! New hair for a new life!”
Raven Symone Instagram
Anna Paquin
The True Blood star celebrated the end of the series with a bold new look: she switched up her golden locks in favor of a vivid violet shade mixed with blue highlights. "@Auracolorist just fulfilled my teen dream of being a mermaid," she tweeted.
Twitter/AnnaPaquin
Demi Lovato
Creative hair color pro Demi Lovato gave her natural brunette hue an amethyst tint with purple and grey ombre highlights.
Lloyd Bishop/NBC/NBCU Photo Bank via Getty Images
Katy Perry
Katy Perry switched up her blunt bob with a "slime green" dye job.
Tibrina Hobson/Getty Images
Kylie Jenner
Kylie Jenner made a splash with a bright blue ombré hairstyle.
Frazer Harrison/Getty Images
Lauren Conrad
No stranger to pink hair, the style icon and natural blonde announced her return to cotton candy strands via Instagram.
John Lamparski/WireImage
Kristen Stewart
Not one for drastic hair changes, Kristen Stewart unveiled a surprising orange hue for an upcoming film role.
Instagram
Nicole Richie
The style maven took the plunge with a dusty pastel shade.
Michael Kovac/Getty Images
Ireland Baldwin
Shortly after giving lilac locks a try, Ireland Baldwin stepped out with an equally springy turquoise hue.
Instagram/irelandbbaldwin
Kesha
If anyone can channel Rainbow Brite on the red carpet, it's Kesha. The singer welcomed the spring season with a rosy, shoulder-length cut and a vibrant streak of green.
Paul Archuleta/FilmMagic
Demi Lovato
How did Demi Lovato kick off her Neon Lights tour? With a day-glo hair color, of course.
Tibrina Hobson/WireImage
Hayley Williams
It's almost impossible to imagine the Paramore frontwoman without her edgy, citrus-inspired style.
John Lamparski/WireImage
Chloe Norgaard
Whether on the runway or off-duty, the model's funky, technicolor strands never fail to make a statement.
Angela Pham/BFAnyc/Sipa USA
Kelly Osbourne
The fashion critic's now signature hair color varies from icy lavender to vibrant purple.
Ethan Miller/Getty Images