Katherine Heigl stepped in after the sudden exit

Anne Hathaway was supposed to play the female lead in 'Knocked Up' opposite Seth Rogen but did not want a graphic birthing scene in the movie.

Katherine Heigl stepped in after the sudden exit

Seth Rogen has opened up on why Anne Hathaway stepped away from the hit movie Knocked Up in 2008, with the role later filled by Katherine Heigl