Donna Mills (born December 11, 1940) is an American actress, most well known for her role as Abby Fairgate Cunningham Ewing Sumner on the primetime soap opera Knots Landing.
http://en.wikipedia.org/wiki/Donna_Mills
www.imdb.com/name/nm0005234/
http://www.youtube.com/watch?v=WlRB49Jvu58