During filming, she said the costume department suggested she take some rice out of the fake belly. As her own pregnancy has progressed, the Oscar nominee said her stomach was "way lighter" than she expected. "I gave myself backache for no reason at all," she joked.

The actress, who plays Sue Storm in the new superhero pic, is currently expecting her first child with her boyfriend, Paul Rabil. She recently made an appearance on Late Night with Seth Meyers, where she shared the difference between having a fake bump in the movie and her real one.

The actress, who is expecting her first baby, stars as a pregnant Sue Storm in 'The Fantastic Four: The First Steps'Vanessa Kirby is reflecting on her Fantastic Four character as she prepares for motherhood.