Scarlett Johansson has revealed why she changed her hair color – because she was “bored” one day. The naturally-blond actress, 24, says she grew tired of her tresses and decided to go dark red because she was stuck at home with nothing to do. “I was bored one day,” Johansson explains. “It was raining and I was with a hairdresser friend and we just decided to color my hair. We experimented with a few shades until we got the right one. I like it. “For a long time I’ve had really white-blond hair. I’m naturally blond – my dad is Danish – and I was playing up to it. I wanted to act out all those famous blond icons – Lauren Bacall, Grace Kelly, Marilyn Monroe. “Ever since I started on the red carpet, my idea of glamor was the Golden Age of Hollywood. I like to be feminine and give people what they want. The hair, the make-up, the gown, the diamonds. That, to me, is glamor.”