Whether they've made us laugh, swoon, or reminisce, all these celebrities have one thing in common: They experimented with red hair. Here, a look back at the most striking reds throughout the decades. Riverdale 's resident redhead is very proud of her cherry locks and even recorded a funny PSA in support of all redheads. Want to know Kate Walsh's secret to her red hair? She uses three different shampoos. Now that's dedication.