To us, dry shampoo is like a miracle product for bad hair days! Whenever those oily roots start to show, do like Cameron Diaz and spray dry shampoo on them and you will go from greasy to red carpet ready in an instant. And did you know that even brunettes like Kristen Stewart can rock dry shampoo too? It's easy to find dry shampoo for darker hair hues! Click on the pics to see more fresh tresses!