A publicist said the pregnancy did not affect the production schedule.
Hatcher also appeared in films such as Spy Kids (2001), Dead in the Water (1991), 2 Days in the Valley (1996) and The Cool Surface (1994).
The episode continued a tradition of former Lois Lane actresses portraying the character's mother many years later.
Noel Neill appeared as Lois' mother in the 1978 film Superman: The Movie, and Phyllis Coates made a similar appearance on Lois & Clark.
The 45-year-old beauty said: “There is still no new man, but it is not for lack of my family and friends trying. Read Full Story Teri Hatcher (born December 8, 1964) is an award-winning American actress known for her role as Lois Lane in the television series "Lois & Clark: The New Adventures of Superman." Hatcher also gained recognition for her portrayal of Susan Mayer in the series "Desperate Housewives." Check out articles, videos, and pictures of Hatcher here.