10/10/2014 07:38 BST | Updated 20/05/2015 06:12 BST

Nicole Kidman, 47, Desperate For Another Baby With Husband Keith Urban

MELBOURNE, AUSTRALIA - JUNE 13: Actress Nicole Kidman and Keith Urban attend the Celebrate Life Ball at Grand Hyatt Melbourne on June 13, 2014 in Melbourne, Australia. (Photo by Scott Barbour/Getty Images)

Nicole Kidman has revealed that she and husband Keith Urban are desperate for another child.

The Oscar winning actress adopted two children, Connor, now 21, and Isabella, 19, with her ex husband Tom Cruise and she has two daughters, Sunday Rose, six, and Faith Margaret, three, with Keith.

She told an Australian radio show: "I hope every month I am pregnant but I never am. I would be jumping for joy, but it wont happen I'm 47."

But when she was told that local TV presenter Sonia Kruger was expecting at the age of 49, Nicole replied: "That's incredible, what a fabulous thing. My grandmother had her last baby at 49 so you never know."

Nicole, whose father Dr Antony Kidman died in September, added: "I'm baby crazy. I love"

Nicole has spoken previously about her struggle to conceive.

She said she thought she'd never have her own children after fertility treatment failed and she suffered miscarriages and an ectopic pregnancy.

Her biological daughter Sunday Rose was born in July 2008 and she had Faith Margaret via a surrogate mother in 2011.

She said: "I had so much time thinking that wasn't going to happen in my life and trying to understand that. When it did happen - and for it to be a surprise - that was great.

"I had tried and failed and failed and failed. Not to be too detailed, but I've had an ectopic pregnancy, miscarriages and I've had fertility treatments.

"I've done all the stuff you can possibly do to try get pregnant.

"Every woman who has been through all those ups and downs knows the depression that comes with it.

"So the way it just happened with Sunday was like, 'What?' The percentages were so low. It is the miracle in my life."