Before: Allison Williams
As the final season of Girls wrapped up, Allison bid farewell to her iconic character Marnie by adopting a blonde new hue for 2017.
After: Allison Williams
But as 2018 approaches, the actress has returned to her brunette roots ahead of the new year.
"Back to my roots. Blonde was fun, but I’ve got to say that I’m happy to be back. 💕💕" she wrote on Instagram today.
Before: Lily Collins
Lily's dark hair has been framed by stunning caramel highlights for some time now! The actress has only switched between a handful of brunette hues during her time in the spotlight.
After: Lily Collins
The actress shared her shock hair transformation with fans on social media, writing: "Not sure if it's the blonde or this city, but I really am having more fun..." We're obsessed with her new look!
Before: Emily Rataowski
The 26-year-old actress and model's signature hazelnut hus has been a constant for most of her career.
After: Emily Rataowski
"Do they have more fun [though]?" Rataowski caption an image posted to her Instagram on Friday, November 10.
Before: Kristen Stewart
Kristen Stewart's bold platinum blonde buzz cut was the perfect compliment to her Chanel jumpsuit at the Cannes film festival in May 2017.
After: Kristen Stewart
The actress stepped out with a darker new mullet recently. A throwback to her Joan Jett mullet which, she rocked for the biopic The Runaways, in 2009.
BEFORE: Lana Del Rey
Lana's iconic long brunette locks are an indie-girls dream, and she's been rocking them in various brown to bronde shades since her Born To Die days.
AFTER: Lana Del Rey
Lana wowed fans with a lush brunette lob at a performance in New York City. Her choppy new 'do is all the rage in 2017, where bobs and lobs continue to reign supreme as the most popular celebrity style.
BEFORE: Ariana Grande
Ariana's signature brunette hue is one of her most iconic feature, especially when tied back in her high ponytail.
AFTER: Ariana Grande
The young star's silver hair transformation has left the internet shaken... and obessed. Fans flocked to Ariana's Instagram post to compliment the star on her dramatic new look.
BEFORE: Nina Dobrev
Nina's signature long locks were chopped into a stylish long bob in 2016. The star has styled her 'do with beachy waves, inspiring many trips to the salon!
AFTER: Nina Dobrev
Nina debuted a stunning, and much shorter blunt do with a blunt fringe. The dramatic hair transformation is her most daring look to date.
BEFORE: EVA MENDES
Eva's signature brunette waves were on full display at an event earlier this year.
AFTER: EVA MENDES
The actress shared a dramatic new, shorter, look on Instagram earlier today.
"How we feeling about men's cardigans these days? Looking for inspiration for new collection. Thoughts?" the 43-year-old captioned the photo.
BEFORE: Lady Gaga
While the chameleon has rocked every colour under rainbow, lately she's been opting for this mermaid style while on the road for her Joanne World Tour.
Image: Instagram @ladygaga
AFTER: Lady Gaga
At the Toronto Film Festival for the screening of her Netflix documentary Gaga: Five Foot Two, the 31-year-old flaunted a shaggy new hair cut. Talk about stepping out with a bang!
BEFORE: Olivia Palermo
Olivia, 31, wears her tousled waves below her shoulder, in a chic lob style.
AFTER: Olivia Palermo
Attending an event in New York over the weekend, Palermo showed off her upgraded new look –love her shorter crop and darker hue.
Before: Laura Byrne
The Bachelor Australia contestant is know for her chestnut brown tresses.
After: Laura Byrne
The Sydney-based jewellery designer sported a lighter, blonder hairstyle on her Facebook page.
BEFORE: Kristin Cavallari
The Laguna Beach star has rocked long blonde locks for as long as we can remember.
AFTER: Kristin Cavallari
The star debuted a brand new tousled lob with choppy layers on Instagram yesterday, which was styled with loose beachy waves.
BEFORE: Khloe Kardashian
Khloé has had buttery blonde highlights for the past two years.
AFTER: Khloé Kardashian
Now, she's ditched her lighter hue in favour of a dark bronde colour by celebrity colourist Tracy Cunningham.
Before: Tara Reid
After: Tara Reid
The actress debuted a bold new fringe at the premiere of Valerian And The City Of A Thousand Planets.
BEFORE: Kendall Jenner
Kendall cut her signature long locks into a sleek long bob earlier this year.
AFTER: Kendall Jenner
Kendall showed up to the premiere of Valerian with a noticeably shorter 'do. Where loving her shoulder-grazing new length!
BEFORE: Bella Hadid
Bella's sleek long bob was on display at the 2017 Met Gala.
AFTER: Bella Hadid
Bella showed off a shorter, choppier 'do as she took a stroll in New York City.
BEFORE: Victoria Beckham
A tousled lob has been Victoria's go-to style in recent years, but it seems she's ready to return to a style that's a bit more posh.
AFTER: Victoria Beckham
Luke Hersheson has labelled this asymmetrical cut the "new bob" on his Instagram.
BEFORE: Chrissy Teigen
Chrissy returned to her dark brown roots earlier this year, pictured here at the Tony Awards in June.
AFTER: Chrissy Teigen
Chrissy showed off Rapunzel-worthy long golden locks on Twitter. Her envious hair was a big hit with fans, with over 35,000 likes in one day.
BEFORE: Karlie Kloss
Karlie had ombre highlights for the past year.
AFTER: Karlie Kloss
Karlie debuted a platinum blonde hair transformation at the Christian Dior Haute Couture show at Paris Fashion Week. The white, icy colour certainly transforms her entire look and vibe. We're loving it!
BEFORE: Gigi Hadid
Gigi has been sporting dark bronde locks over the past year, after growing out her highlights.
AFTER: Gigi Hadid
Gigi was seen stepping out with a shorter and much brighter blonde 'do earlier this week.
BEFORE: Phoebe Tonkin
The Originals actress sporting warm chestnut waves at Chanel's Pre-Oscar Awards Dinner.
AFTER: Phoebe Tonkin
Taking to Instagram, the Australian-born star debuted her ear-length crop.
BEFORE: Jesinta Franklin
Jesinta teased her decision with an Instagram video writing, "a spur of the moment decision 🙊 "
AFTER: Jesinta Franklin
The model showed off a chic 70s inspired fringe.
BEFORE: Kaley Cuoco
Kaley freshened up her icy blonde hue with a trip to the salon on the 3rd of January.
AFTER: Kaley Cuoco
Less than two weeks later, Kaley debuted a silvery do! With grey, blue and purple tones, the new colour is hard to describe. The actress herself said it was "dreamy sherbert hair," so we think we'll stick with that.
Gigi showed off her dark bronde colour on the 2017 CFDA red carpet.
BEFORE: Katy Perry
Katy's edgy pixie crop made it's debut in March, since then the Kissed A Girl singer has been rocking a blonde hue.
AFTER: Katy Perry
Katy took to Instagram to announce her upcoming tour with a new look! Going back to her look circa 2008, Katy's dark hair brings certainly brings out her blue eyes.
Before And After: Zoe Foster Blake
Taking to Instagram Zoe shared her transformation, writing: "I went to my hairdresser today (photo on left is before shot) with designs on a blunt bob, but was talked out of it. Thankfully. Hormonal hair decisions are bad hair decisions. @hairbylaurenm kept it long-ish, but sliced through the mid-lengths to ends like Eddie goddamn Scissorhands to remove bulk, and make it "rattier and stringier and lighter” a request she was only partially offended by. (She also did some killer colour, as you can see.)"
The star continued, "One of pregnancy’s popular side effects is thick hair. But my hair also becomes wig-like, lank and obnoxiously heavy. Texture and shape abandon me; my usual styling sorcery is futile. I recognise that on the scale of World Problems, this hovers somewhere near zero, but should you also be in the thick hair camp and wish for more textured, defined hair, this may be of help:
Let your hair dry as much as poss before you style it. Even better, wash it at night and roughly dry it off, then style dry/shape it in full the next morning. Wash as little as possible cos it takes ages/is dull/dry shampoo exists.
Use "dirty-uppers” to add texture and sass. I apply a texture spray or mousse (I love Oribe Surfcomber) and roughly blow-dry it through freshly washed hair before bed for grit and easy styling the next day. On dry hair, I either use a sea salt or texture spritz all over (there are millions of good ones, I like O&Ms) for roughness, and anti-boofness. OR, if I want soft definition and separation I turn to texture balms and cremes that make the hair smooth but piecey, (like Oribe Matte Waves), and make you look like you may be French and 19 and in a band. Or, Alexa Chung.
Oh and one final thing: remember to laugh at my post in six months where I complain about my hair all falling out. Cheers."
Before: Bella Hadid
The supermodel is well known for her slicked back style.
After: Bella Hadid
We think the star's short fringe is reminiscent of Audrey Hepburn–très chic!
BEFORE: Salma Hayek
The actress showed off her sleek brunette long bob at the 2017 Cannes Film Festival.
AFTER: Salma Hayek
The actress looked unrecognisable (and stunning) with a striking rose gold colour.
Before: Blac Chyna
The Rob & Chyna star is no stranger to rainbow coloured locks however, her most recent hue has been black.
After: Blac Chyna
"Loving this hair cut 🎀 Strawberry Shortcake vibes," the mother-of-two captioned this resh-hair selfie.
BEFORE: Shailene Woodley
Shailene's signature brown locks earlier this year.
AFTER: Shailene Woodley
Shailene debuted a solid blonde colour, after a visit to her colorist Kari Hill of Meche Salon in Los Angeles.
BEFORE: Elsa Pataky
Elsa wore her longer blonde hair sleek at the premiere of The Fate And The Furious.
AFTER: Elsa Pataky
BEFORE: Olivia Wilde
Olivia debuted a dirty blonde bob in February.
AFTER: Olivia Wilde
Olivia showed off her new look on Instagram, writing: "dark times call for dark hair. #1984play"
BEFORE: Emma Stone
Emma was last spotted with her signature red hue at the 2017 Oscars in February.
AFTER: Emma Stone
Emma went back-to-blonde with this sweet strawberry blonde colour, which she showed off at the Audi Polo Challenge over the weekend.
BEFORE: Snezana Markoski
The Bachelor star's long brown locks have become her signature.
After: Snezana Markoski
Short hair, don't care!
Katie Holmes: Before!
Katie's long brown waves have become her signature.
Katie Holmes: After!
The actress debuts a chic lob!
Before: Sam Frost
While she rocked a brunette hue in 2016, Sam Frost has been a member of team blonde since then. The radio presenter and former Bachelorette's signature style is this blonde hue locks as seen on Instagram last week.
After: Sam Frost
Via her Instagram Story, Frost showed off her new hair after visiting Headcase salon in Paddington, Sydney. "Fresh hair," she captioned the snap which shows the subtle darker hues in her new colour.
BEFORE: Sophie Turner
Sophie showed off platinum blonde locks at the Golden Globes earlier this year.
AFTER: Sophie Turner
The Game Of Thrones star showed off a Coachella-ready pink hue when she attended the festival over the weekend.
BEFORE: Zoë Kravitz
AFTER: Zoë Kravitz
"Oh shit: part 2 #newhair #whodis?" she captioned the gorgeous Instagram photo.
BEFORE: Elsa Pataky
The Spanish actress wore her shoulder length hair up at the Golden Globes in January.
AFTER: Elsa Pataky
Pataky gave her Instagram followers a new look at her shorter cut and fringe today. The Fate of the Furious star is travelling to new York for the film's premiere.
BEFORE: Megan Gale
The stunning brunette's lush waves are her signature.
Photography: Hugh Stewart
After: Megan Gale
The star debuted a fresh shop on her Instagram account writing, "4 months since I've had some hair love 🙈 A much needed cut & colour with @travisbalckehair & @laboutiquehair has got me feelin' like a new woman."
BEFORE: Kim Kardashian West
Kim Kardashian West has spent the first quarter of 2017 with *extra* long hair extensions.
AFTER: Kim Kardashian West
The 36-year-old revealed a shoulder-length asymmetrical lob. The social media maven flaunted a much shorter style on Snapchat.
Lady Gaga has rocked her signature blonde locks for years now.
Gaga showed off a dark new look as she posed for a selfie in her car (if your eyes are deceiving you, yes that is a fur on her shoulder). Her dark new hair was styled up, and her colourful makeup on full display. We certainly had to do a double take!
BEFORE: Chris Pine
The Star Trek: Beyond actor's perfectly coiffed locks have stolen the hearts of many.
AFTER: Chris Pine
The 36-year-old revealed Homeland's Rupert Friend inspired his new look, adding that he took the plunge and grabbed the razor because he was "bored."
Jesinta showed off a shaggy new fringe.
In 2016 Pink rocked a pastel pink hue, before letting it fade to dark blonde during her pregnancy.
The singer goes full 2000s with a magenta and purple dip dye colour, and edgy asymmetrical cut.