If you're a One Direction fan [1], you already know who Lottie Tomlinson is. But believe us, unacquainted beauty addicts: you're about to be obsessed. The 17-year-old Brit is the younger sister of 1Der (and soon-to-be dad) Louis Tomlinson. She's become famous in her own right due to some serious hair and makeup skills — she's actually the assistant to celebrity stylist and makeup guru Lou Teasdale [2]. Lottie has her own YouTube beauty tutorial channel [3], where she's gained over 100,000 followers in just one month.

Now the teen, Teasdale, and Bleach London salon [4] have all teamed up to create the latest and greatest rainbow hair [5] trend: rainbow roots. Anyone who has gotten their roots touched up will identify with this new look. It appears exactly the same, but instead of correcting highlights [6] or hiding grays, Lottie added vibrant colors in three-inch-wide strips coming out of her center part. The result is dreamy, surprisingly subtle, and could almost trick your friends into thinking you're secretly a unicorn. Read on for a closer look, and stay tuned — we expect Lottie will share the video of this process on her vlog.