From Sienna's peachy pink hue and Georgia May Jagger's blorange, to Lady Gaga's vibrant turquoise and every pastel wig Kylie Jenner's ever worn, it's official - rainbow hair is the celeb approved 'do we never get bored of.
Check out our edit of the best rainbow hair in the biz so you can embrace your inner unicorn ASAP.More
Nicole Richie gave her usual honey blonde hair a lavender unicorn overhaul with the addition of purple highlights courtesy of Joico's new Color Butter temporary hair dyes. 'I actually saw all the colours and I decided to go lavender', Richie told InStyle. 'Because colour is emotional, and I was here and I was like, you know what, lavender was the first colour that I had when I started colouring my hair. It's cooling and soothing, and it just felt like where I wanted to go today.'
Lena Dunham gave her pixie cut a mermaid overhaul transforming her previous blonde/brunette hair into a bright blue and dark grey 'do. Dunham posted a selfie of her new look with the caption: 'Thank you @gregoryrussellhair for handling my pompadour and for the hot smurfjob. Love you mean it 💎'