Cate Blanchett and husband Andrew Upton welcomed their third baby, Ignatius Martin, on Sunday in Sydney.

Blanchett and playwright Upton, joint artistic directors of the Sydney Theatre Company, already have two sons: Dashiell John, 6, and Roman Robert, 3.

Blanchett won an Oscar in 2005 for playing Katharine Hepburn in "The Aviator." She was nominated this year for her lead role in "Elizabeth: The Golden Age" and for her supporting role as Bob Dylan in "I'm Not There."

Blanchett returns to theaters next month in "Indiana Jones and the Kingdom of the Crystal Skull," the fourth installment of the Steven Spielberg adventure series, along with Harrison Ford and Shia LeBeouf.