Watson struggled with pregnancy

Emma Watson. Picture: Evan Agostini/Invision/AP

Actress Emma Watson isn't looking forward to falling pregnant after a weighted prosthetic baby bump she wore in new movie Noah left her exhausted.

In the film, which stars Russell Crowe as the ark-builder, Watson portrays Noah's adopted daughter Ila, who is pregnant with twins.

To add authenticity to her performance, Watson asked costume experts to create a fake stomach that weighed as much as it would if she were actually pregnant with twins.

However, shooting with the prosthetic piece was more difficult than Watson expected.

"I came up to her (costume department head) the next day and I was like, 'You can't be serious, I'm exhausted, this is crazy', and then she turned to me and said, 'Yeah, that's just the weight of one child...' Watson says.

"I called my mother after the first day of shooting and I was like, 'This is crazy', and she was like, 'You don't get to complain, you only faked it'. I have a whole new respect for women and motherhood."

  • Noah is now playing in Australian cinemas.