Cate Blanchett has been married to Andrew Upton for 16 years, and reckons she knows the secrets to a happy marriage.

The 44-year-old Oscar winner says trust is a huge part of their marriage, so much so that they have the same email address.

“We work together and it’s a way of synchronising our lives.  I can see what he’s up to – it’s not that I don’t trust him,” she told The Daily Mail.

Despite playing a neurotic scorned woman who suffers a breakdown in Blue Jasmine, in real-life, Blanchett couldn’t be further from her character, admitting that being a hands-on mum to their three sons – Dashiell, 12, Roman, nine, and Ignatius, five – is important to her.

Family life in Sydney is “a well-oiled machine,” she says.

“I’ve got a whole system going. I know what has to be done by the end of the evening, and what has to be done by the end of the morning.

“Three lunch boxes, three school bags, three sets of school uniform. Maybe I’m old-fashioned, but I have to write everything down.”

Despite her hectic filming schedule, she makes sure she’s never away from her children for more than a few days.

“When we did Blue Jasmine in San Francisco, they came with me. I’m about to do a Cinderella film for Disney, and that’s over the holidays, so they’ll come too.”

Would you share an email address with your husband? Tell us in the comments!