Cara Delevingne goes platinum blonde - see her new look and other 2017 celebrity makeovers

Cara Delevingne Cara Delevingne showcased a platinum blonde bob as she enjoyed a night out during Paris Fashion Week. The Suicide Squad star wore her freshly-bleached locks braided on one side, leaving the other side down.

X Factor winner Louisa Johnson debuted a new aqua hair colour as she was named the new face of Colorista wash out hair dye by L'Oreal Paris. Speaking about her new look, Louisa said: "I always dreamed of being a L'Oreal girl when I was younger! Today I'm launching the Colorista hair colour range. I love the fact you can change your hair colour really easily with this product.

"I changed my own hair colour to blue myself this morning. I'm truly excited to be a brand ambassador for L'Oreal Paris."

Dawn O'Porter went for a spontaneous hair cut, cropping her signature bob into a dramatic pixie cut. The mum-to-be showed off her dramatic transformation on Instagram, telling her followers: "It's so short!! But I have my safety blanket (fringe)." Dawn also admitted that she hadn't originally planned to go so short, adding: "I didn't even know I was going to do this last night. Just woke up and did it."

Olivia Wilde is the latest famous face to go blonde, and unveiled her new bleached bob on Instagram on Tuesday. "Oh what's up, BLONDE LIFE," she captioned a photo of her edgy new do. The new mum later posed for a photo alongside her friend Kate Mara and joked that she had copied her hairstyle. "When you roll up to the party with your new look and it turns out you just single white femaled your friend you haven't seen in a year," she wrote.

Katy Perry has gone back to her roots as she prepares to make her return to the music industry. The Roar singer unveiled her freshly bleached hair in an Instagram photo on Tuesday, simply writing: "New life who dis." Katy first dyed her hair earlier this year, showcasing an orange-toned bob as she hosted her boyfriend Orlando Bloom's 40th birthday party in January, but she has since gone even lighter ahead of her performance at the Grammy Awards on Sunday.

Selena Gomez After kicking off the year with a new love interest – The Weeknd – Selena also left her long tresses behind. Hairstylist Marissa Marino shared this photo, right, of the star on her Instagram, giving us a sneak peek at the look. Photos: Getty Images, Instagram/@_marissamarino

Nina Dobrev "Short hair. Don't care. New year. New Do(brev)," Nina declared on Instagram. Showing off her carefree cut, right, in the photo, she also gave a shout out to her hairstylist, continuing: "@xxxmovie #London Hair by RiRiCapri... aka @riawnacapri." Photos: Getty Images, Instagram/@ninadobrev

Celine Dion Celebrity makeup artist Charlotte Tilbury shared a picture of Celine Dion sporting a new 'do. The singer kick started the new year by brightening up her honey-hued hair with a lighter shade and highlights. Photo: Getty Images, Instagram/@charlottetilbury

Bella Thorne The singer-actress took going green to a new level for 2017, swapping red, long and blonde for an aquamarine lob, right. Photos: Getty Images

Katy Perry The now-blonde singer showed the world her 2016 long, dark tresses are history – for now, anyway! – when she was snapped, right, with pop artist Sham Ibrahim at Club Liz at Oscar's in Palm Springs, California. Photo: Tara Ziemba/Getty Images

Jodie Sweetin The Fuller House star started the year with a fresh cut and color, right. "Well, hello #2017 !! Time for a new look! Thank you @josephmichael_hair for giving me a fun new 'do to start out the year!!" she wrote on Instagram. Photos: Getty Images, Instagram/@jodiesweetin