While her brunette phase was all thanks to celebrity colourist Tracey Cunningham , the new and lighter look is courtesy of Anja Burton, the colourist at the trendy L.A. salon, Ramirez Tran . With her roots lightened and ends sun-kissed, we can't help but love the summery colour's return. And in the land of constant hair changes, we dig that Koko certainly sticks to her signature look.