The couple never officially announced that they were expecting; however, Blazic was visibly pregnant on the red carpet at the Academy Awards in March, where Bale was nominated for his performance in American Hustle.
Bale and Blazic, a former model and makeup artist, have been married since 2000. The fiercely private couple have a 9-year-old daughter, whose name they have never revealed.
Bale will next be seen as Moses in Ridley Scott's Exodus: Gods and Kings, which is due out Dec. 12.
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