Celebrities Who Were Actually Pregnant While Filming

Keira Knightley / Everest

After releasing a photo of Keira Knightley with a baby carriage, people found out about Knightley's relationship (she married James Rayton). Knightley was pregnant at the time of the movie Everest, in which she was playing the pregnant wife of a climber. But even the filmmaker didn't realize she was really pregnant.