Does julianna margulies wear a wig on the good wife?

Does julianna margulies wear a wig on the good wife?
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.