Lindsay Lohan is going back to her roots. After several years as a blond, the 40-year-old actress returned to her signature red hair recently, posting Instagram photos Tuesday of the color transformation. Lohan’s longtime hairstylist, Danielle Priano, was behind the mane makeover — and the star’s fans were thrilled to see her fiery locks back. One commented on Lohan’s post calling her “the most iconic redhead in pop culture,” while another wrote, “Redhead Lindsay is the best Lindsay.” “She’s back!” another chimed in, while still more called her new (old!) look “iconic,” “stunning” and “gorgeous.” While Lohan’s experimented with a variety…