The I'm Not There actress recently gave birth to third son Ignatius Martin with her husband Andrew Upton and says the couple can't wait to further expand their brood.
Cate - who also has sons Dashiell John, six, and four-year-old Roman Robert with Andrew - said: "Having kids is very addictive, if you can, if you're able to and it's your choice and you've got a supportive relationship."
The actress recently revealed becoming a mother has made her a better person and improved her life considerably.
She said: "You realise how much love you're actually capable of. It's like more doors open in your personality that you didn't even realise were there. It's a trip, being a parent, a privilege - even though it means you get a lot less sleep!"
Cate and Andrew - who have been married for 10 years - are based in Australia, where they also work as co-directors of the Sydney Theatre Company.
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