Natalie Portman's father is shopping a pregnancy movie to Hollywood studios.

Dr. Avner Hershlag's book 'Misconception' is a story of cloning experiments gone wrong and the embryos of a US first lady, and major film distributors are said to be interested in the project because of his daughter - who this year won the Best Actress Oscar for her role in psychological ballet thriller 'Black Swan'.

According to the New York Observer, the Long Island fertility specialist was convinced to publish the story - which he has already written - by himself following rave reviews from friends.

Natalie is currently pregnant with 'Black Swan' choreographer Benjamin Millepied's baby, the couple's first together.

The 29-year-old actress has had a number of films come out in recent months, including romantic comedy 'No Strings Attached' with Ashton Kutcher and Darren Aronofsky's 'Black Swan'.

In the coming weeks she has fantasy movies 'Your Highness' and 'Thor' hitting cinemas.