London, Nov 13 (IANS) Actress Angelina Jolie says she got so emotional while shooting 'Changeling', in which she plays a mother who fought the police when they mistook another boy for her missing son, that something 'kicked into gear' and she got pregnant with her twins Knox and Vivienne.

The film is inspired by the real life story of a California woman Christine Collins and is being directed by two-time Oscar winner Clint Eastwood. Contactmusic.com reports that the emotion involved in the movie caused Jolie to become a mother in real life.

She said: 'I got pregnant right in the middle of it (film) and, I think, partially because of it. I was so emotional about children that I think something kicked into gear.'

Jolie gave birth to the twins in Nice, France in July.