debuted a shocking hair color transformation via Instagram: the 28-year-old and blonde for as long as we can remember is now—gasp—a redhead! And we don't mean she got red highlights ...

To achieve the colour, Hart used Bleach’s Cherry Red dye, a permanent shade that uses no bleach. After a successful strand test, Hart told me the colour would work really well for my hair ...

Bleach is a popular ingredient used to lighten hair, but it's not the only option. Here, three celebrity colorists explain ...