Earlier this month, Kensington Palace announced the Duke and Duchess of Cambridge were expecting their third child and that the new mum-to-be was suffering from Hyperpremesis Gravidarum (extreme morning sickness).
As a result, the 35-year-old mother-of-two has been taking it easy of late and was even forced to sit out on taking her son Prince George's to his first day of school two weeks ago.
However, the patron of the mental health charity Anna Freud National Centre for Children and Families has taken the decision to step out in front of the camera to raise awareness of the importance of talking about mental health, despite her illness.
Introducing the animated film on the subject, the Duchess says: 'Hello, mental health is how we feel and think. Things that can't really be seen but that affect us every day, and talking about them can feel difficult.
Wearing a blue buttoned-up coat dress, the royal went on to discuss the benefits of talking about mental health with others and advising people how they can support their loved ones who may be struggling.
'It helps us all to talk about our mental health: what to say and who to talk to when we have feelings that are too big to manage on our own and how to listen and help if one of our friends is finding things difficult. Sometimes it's just a simple conversation that can make things better,' she adds.
'I do hope you like the film,' she signed off her introduction.
The film stars a group of young children who are depicted as fingerprints.
In the clip, each student discusses the way they experience different emotions, ranging from 'small feelings' like happiness to 'big feelings' that affect their daily lives and how they manage them in unique ways.
This isn't the first time the Duchess has spoken openly on the subject of mental health.
Over the years, she's worked tirelessly with her husband Prince William and brother-in-law Prince Harry on the Heads Together campaign, giving out headbands for the organisation ahead of the London Marathon, and sharing a video about them discussing the importance of ridding the shame surrounding the health issue.
It's good to see you looking so well, Kate.