The actress claims she and husband Ashton Kutcher - who she wed in 2005 - both have such an amicable relationship with her ex-husband Bruce Willis, with who she has three daughters, because none of the adults put themselves first.
Speaking on `Friday Night With Jonathan Ross`, she said: "The most important thing is to make your kids your priority, so it becomes very easy."
Despite this, Demi, 47, admits having a husband 15 years her junior does mean he can be childish, such as posting pictures of her in a pair of knickers on twitter, but she is happy to play along with his pranks.
She added: "I`m laying in wait to get him."
Demi - who took a six-year break from acting following her divorce from Bruce - also admitted it was Ashton and her children, daughters Rumer, Scout and Tallulah, who pushed her back into work.
She said: "My kids started saying, `When are you going to work again?? "
The actress has previously spoken about she felt very insecure making her big screen return in 2003, but knew it was something she had to do.
She said: "When I stepped away, I experienced a tremendous amount of criticism. It made me question whether I actually wanted to be this at all. Did I really want to put myself out there?
"As human beings, we all need other people`s approval. But you can`t live your life seeking like that. It`s a recipe for unhappiness. I realise now that when you`re just starting, you haven`t gotten anything yet to understand the fear of losing it. I`m much more vulnerable today."
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