Kate O'Mara(1939-2014)

She gave birth to a baby boy on May 12, 1965, from a brief liaison with David Orchard, who she met on the set of No Hiding Place (1959). Being already a single mother at the time of his birth, she gave the baby up. He was adopted by a married couple, Derek and Joy Linde and named Christopher Linde.

I would like to be where Diana Rigg or Judi Dench is, but I expect it is as good as it is going to get.