AceShowbiz - Michelle Williams, age 44, and her husband, Thomas Kail, have quietly welcomed their fourth child into the world via surrogate. This latest addition marks their third child together, solidifying their growing family.

"They couldn't be happier to expand their family, and Matilda has been doting on her younger siblings," an insider revealed to People. The baby was born six weeks ago and the family of six has been seen out and about in their New York neighbourhood.

Williams and Kail met on the set of FX's "Fosse/Verdon" in 2018 and married in 2020. The actress is already a mom to two children with Kail and has a daughter Matilda, 19, from her previous relationship with late Heath Ledger.

Despite her demanding career, Williams remains dedicated to her family. After the birth of her third child, she spoke candidly about balancing motherhood with her professional life.

"My heart obviously belongs to my children; they tug at it the most," she acknowledged. "But I really want to be able to have both [family and a career]. And I think that it requires deep thought and learning and the support of other women to figure out how to get through it."