Get Hollywood Hair Color:
Find the Best Hair Color for Your Skin Tone
Maintain Your Shade: Fair Skin
Most blond tones start to fade two weeks after they've been applied, says celebrity colorist Marie Robinson, who works with Scarlett Johansson. Use Pantene Pro-V Blonde Expressions Color-Enhancing Shampoo ($6; drugstore.com) to keep the hue as vibrant as possible.