Oscar-winning actress Cate Blanchett has given birth to her third child, welcoming another boy in to her family with playwright husband Andrew Upton.

The Elizabeth: The Golden Age star gave birth to son Ignatius Martin Upton on Sunday weighing just over eight pounds (3.6kg), according to Australian reports.

The 38-year-old beauty married Upton in 1997 and has two sons with the writer/director, Dashiell, 6, and Roman, 3.

Initial reports from Blachett's representatives state the mother and child are doing well.