I do not think so. her hair looks the same in magazine pictures.
From an interview of The Good Wife producer David Zucker:
But the big reveal at the panel was Margulies wears a wig as Alicia, and she ensured that was written into her contract before she took the role. For the pilot, the wig was flown in from London - where it was made - and delivered to Vancouver, where first episode was shot, all at a very hefty cost.
The reason? According to Zucker, she wanted to look completely different from Nurse Carol Hathaway, the role she played on "ER" for 135 episodes.
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They may be distant relatives, but they are not brother and sister (different mothers and fathers) or husband and wife (She is married to Keith Lieberthal).
"The Tree" by Julianna Zobrist (Ben Zobrist's wife)
Keith Lieberthal (husband of Julianna Margulies) is about 41 years old. (born circa 1976).A different source shows him born circa 1974 and 8 years younger than his wife, who was born June 8, 1966).
lawyer
Batman and Catwoman would be good costumes for a husband and wife.