The actress made the announcement in a picture on Instagram of herself and her two daughters.
Her eldest daughter is holding up a balloon in the shape of a 1, her second has a 2 balloon and Alba is holding a 3 balloon with her hand on her stomach.
Alba rose to fame in James Cameron’s Fox series “Dark Angel” in the 2000s.
She’s starred on the big screen in “Sin City” and its sequel and other films.
The 36-year-old is also a co-founder of The Honest Company.
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