Hilary Duff
The 27-year-old continues to experiment with candy-colored hair hues, trading in mermaid green for bright pink.
Lily Allen
Surprise! She dyes her hair yet another colorful shade, this time settling on a "watermelon."
Julianne Hough
It's a new pink hue for the Dancing with the Stars judge!
Amy Poehler
Blond knope no more! The star debuted coppery red locks at a literary event in Los Angeles on April 7.
Debby Ryan
Redhead no more! The Disney star changed up her fiery hair hue with a light lavender shade.
Minka Kelly
Clear eyes, full hearts, blond hair! The Friday Night Lights alum dyed her locks a warm honey-blond shade.
Freida Pinto
Buh-bye dark winter locks, hello lighter spring tresses! The actress sheds her dark chestnut color for lively caramel highlights.
Hilary Duff
The actress made a major springtime hair change—we're talking lite-brite teal locks—on March 18.
January Jones
The Mad Men star went from her normal blond color to a pretty muted pink for spring.
Cameron Diaz
The star toned down her golden blonde locks to a brunette hue with honey highlights.
Kim Kardashian
Platinum surprise! Mrs. West showcased new ultra-blond locks upon arrival to the Balmain show at Paris Fashion Week.
Chrissy Teigen
The model showcased her dark dye job in progress after her stunning (and decidedly blond) appearance at the 2015 Oscars.
Nicole Richie
From lilac to teal blue to lite-brite pink—Nicole Richie's hair has been on one crazy rainbow ride since she took the purple plunge in 2014.
Diane Kruger
The German stunner debuted chic strawberry blond locks on the 2015 Critics' Choice Awards red carpet.
Emily Blunt
Emily also showcased a new, blonder look at the 2015 Critics' Choice Awards—which was actually a return to her natural hair color.
Audrina Patridge
The star revealed "dusty violet" locks to her Instagram followers on Jan. 12.
Nicole Snooki LaValle
The reality star traded in her long red locks for a chic, shoulder-length black 'do.
Maggie Grace
The star debuted fiery red locks at a Golden Globes event in Los Angeles on Jan. 8.
Lena Dunham
Ode to her natural roots: Dunham debuted chestnut brown locks while out and about in Brooklyn on Jan. 4.
Rachel McAdams
The star (and consummate hair chameleon) debuted a winter-ready dip-dyed look on Dec. 19 at LAX.
Katy Perry
The singer wasn't letting 2014 end without one last hair color change. This time she went for a pretty purple hue.
Zosia Mamet
The Girls star trades bright blonde for seal gray!
Rita Ora
Time to switch things up. The singer opts for a blue hairstyle just in time for the Thanksgiving holiday. "True Blue for Abu Dhabi by the besties @chrisappleton1 @eosborne_makeup beats by the beach!!" she wrote on Instagram.
Raven-Symoné
The star took her locks from a multihued ombré to a peachy orange color for the holidays: "Yes, peach for the holidays... #unicorn #5thelement #holidaypumpkin," she wrote alongside the photo on Instagram.