Andrea Morris (born July 10, 1983) is a Canadian actress. She plays the role of quiet, shy, homeless girl Margaret on 7th Heaven. Her character was first introduced in the Season 11 episode "The Replacements", whom the Camdens eventually decide to take in. Morris is a science and technology journalist, ongoing contributor to Forbes, and author of the book "The Science of On-Camera Acting" in collaboration with Dr. Paul Ekman which documents a neuroscientific perspective on how audiences perceive human emotion and expression filtered through the lens of a camera.