Rachel McAdams is another celeb who looks great in several different hair colors. What makes them work for her? “Her cut and style choices,” Robinson says. Dark hair can overwhelm the face, but it didn’t for her because she wore it “short and sleek.” And the Barbie-pink lipstick is the perfect touch against her dark hair.

Our humble opinion: “Love the deep, rich chocolatey brown here. It effortlessly makes her hair look so healthy.” — Anna, Assistant Editor

Next: Rachel McAdams as a redhead