The actress is currently expecting her second child with husband Benjamin Millepied. The two are already parents to 5-year-old son, Aleph, who she gave birth to shortly after winning her Best Actress Oscar in 2011 for Black Swan.
Portman also seems to be an Oscar contender this year for her role as Jackie Kennedy in Jackie.
ET sat down with the pregnant star in November, where she revealed the "scary" obstacle she overcame in order to play the role.
"It was very scary to take on somebody that people know so well -- the way she looked, the way she spoke, the way she moved," Portman admitted to ET's Nischelle Turner. "You have to overcome that hurdle before you can even get people to sign on to emotionally empathize with you."