‘Pretty Little Liars’ Star Sasha Pieterse Reveals How Often She Washes Her Hair

Sasha Pieterse’s character, Alison DiLaurentis, on Pretty Little Liars used to be the secret-holding queen bee and, in turn, went "high" in her fashion and style choices. But in real life, the 21-year-old actress is more interested in eco-friendly beauty and style products than in reigning over the social scene. Pieterse sits down with Yahoo Beauty to share some of her best style and beauty tips. Watch the video to see what she has to say.