Exclusive: ABC's Mistresses Casts JoBeth Williams as Alyssa Milano's Mom

JoBeth WilliamsAddison’s Private Practice mom has found a new family.

ABC’s midseason drama Mistresses has tapped JoBeth Williams — aka Addie’s troubled ma Bizzy — to play the mother of Alyssa Milano and Jes Macallan’s characters, TVLine has learned exclusively.

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Based on the British format by the same name, Mistresses follows four women (Milano, newcomer Macallan, Lost‘s Yunjin Kim and Work It‘s Rochelle Aytes) as they balance their turbulent romantic and personal lives. The series also stars Jason George (Grey’s Anatomy) and Aussie Brett Tucker (Castle, Spartacus: Vengeance).

Though originally slated for summer 2013, the drama has been moved to the coming midseason.

Williams — whose other recent credits include Scandal and Hart of Dixie — will appear in Episode 9.