‘Nothing can really prepare you for you the sheer overwhelming experience of what it means to become a mother'

She may have a live-in nanny at her Kensington Palace home but motherhood hasn’t been a walk in the royal park for Kate Middleton, she has revealed.

The Duchess of Cambridge gave a speech on the subject of motherhood today (Thursday 23rd) as she attended the launch of a film series about maternal mental health titled Out of the Blue.

Released just days ahead of Mother’s Day (this Sunday, in case you’d forgotten), the films aim to raise awareness of the mental health challenges faced by mums and get people talking about the wellbeing of mums, dads and kids.

MORE: 20 Mother’s Day gift ideas to make your mum smile

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This collection of films highlights how vital it is to be open about our mental health, especially in the early years of parenthood,’ HRH told the audience at the Royal College of Obstetricians and Gynaecologists.

Kate, who has two children, Prince George, 3, and 1-year-old Princess Charlotte with hubby Prince William, went on to celebrate the joys of becoming a mother.

But she also addressed the difficulties, saying: ‘Personally, becoming a mother has been such a rewarding and wonderful experience. However, at times it has also been a huge challenge – even for me who has support at home that most mothers do not.

‘Nothing can really prepare you for you the sheer overwhelming experience of what it means to become a mother. It is full of complex emotions of joy, exhaustion, love, and worry, all mixed together.’

Kate added: ‘Your fundamental identity changes overnight. You go from thinking of yourself as primarily an individual, to suddenly being a mother, first and foremost.’

She also chatted to other mums about their experience of maternal mental health issues including post-partum psychosis.

The Duchess began her speech by paying tribute to the victim’s of Wednesday’s terror attack in London, saying: ‘I know you would all want to join me in sending our thoughts and prayers to all those sadly affected by yesterday’s terrible attack in Westminster.

‘We will be thinking of all the families, as we discuss the important issues we’re here to talk about.’

Other celebs to pay tribute in the wake of the attacks include Niall Horan, Vicky Pattinson and Holly Willoughby – whilst Katie Price was criticised for her tweet.

You can learn more about the Out of the Blue films here.