The 30-year-old star, who wowed in last year's Oscar-winning Black Swan, met the baby's father on the movie set. She is engaged to Benjamin Millepied, who choreographed her dancing in the dark psychological thriller. Though extremely private, Portman called herself "indescribably happy and feel very grateful to have this experience" in a recent interview while pregnant.

Millepied's been quoted saying he's"going to take a lot of time off to enjoy this new stage of life that I'm really looking forward to. It's the unknown and there's something so exciting when you know life one way and you can do all kinds of projects and exciting things. But this is going to be so different and new and I love that idea."