Catherine, Duchess of Cambridge Visit to the Royal Society of Medicine in London on March 21, 2018

Pregnant Catherine, Duchess of Cambridge looked radiant in a bespoke green coat dress with a bow detail at the collar by Jenny Packham, worn over a mint dress, teamed with her favourite blush suede heels.

Catherine, Duchess of Cambridge looked glowing as she completed one of her final engagements before going on maternity leave. She is due to give birth to her third child in April, weeks before Prince Harry and Meghan's wedding.

The Duchess of Cambridge is attending events celebrating the Commonwealth tomorrow before heading on maternity leave

A smiling Catherine, Duchess of Cambridge looked blooming this morning as she attended one of her final engagements before giving birth

Catherine, Duchess of Cambridge opting for a bespoke dress and coat by Jenny Packham with the pretty bow detail at the collar, she teamed with a pair of her favourite Gianvito Rossi pumps in blush suede, arriving for a conference held by The Royal Foundation in London

The Duchess of Cambridg looked radiant in a bespoke green coat dress with a bow detail at the collar by Jenny Packham, worn over a mint dress, teamed with her favourite Gianvito Rossi blush suede heels, attending symposium at Royal Society of Medicine in London.

Catherine, Duchess of Cambridge looked glowing as she completed one of her final engagements before going on maternity leave

The Duchess of Cambridge is due to give birth to her third child in April, weeks before Prince Harry and Meghan's wedding, arrives for a symposium of leading academics and charities championing early intervention into the lives of children at the Royal Society of Medicine in London.

The Duchess of Cambridge arrives for a symposium of leading academics and charities championing early intervention into the lives of children at the Royal Society of Medicine in London.

The Duchess of Cambridg looked radiant in a bespoke green coat dress with a bow detail at the collar by Jenny Packham, worn over a mint dress, teamed with her favourite Gianvito Rossi blush suede heels, attending symposium at Royal Society of Medicine in London.

Catherine, Duchess of Cambridge looked in great spirits as she arrived at the event. She was welcomed by Sir Simon Wessely, president of the Royal Society of Medicine

Britain's Catherine, Duchess of Cambridge is greeted by President of the Royal society of Medicine, Sir Simon Charles Wessely on her arrival for a symposium at the Royal Society of Medicine in central London on March 21, 2018.

The Duchess of Cambridge arrives for a symposium of leading academics and charities championing early intervention into the lives of children at the Royal Society of Medicine in London.

Britain's Catherine, Duchess of Cambridge is greeted by President of the Royal society of Medicine, Sir Simon Charles Wessely on her arrival for a symposium she convened with The Royal Foundation on early intervention for children and families, at the Royal Society of Medicine in central London on March 21, 2018.

The Duchess of Cambridge is attending an event that brings together academics, researchers, practitioners, educators and charities to explore issues such as perinatal, maternal and infant mental health, parenting support and advice, and resources for schools and educators in London

Pregnant Catherine, Duchess of Cambridge is attending symposium at Royal Society of Medicine in London

Pregnant Catherine, Duchess of Cambridge tenderly cradles her baby bump while wrapping up her royal duties ahead of maternity leave

The Duchess of Cambridge stood out on arrival, opting for a bespoke dress and coat by Jenny Packham with the pretty bow detail at the collar, for a conference held by The Royal Foundation in London

The Duchess looked ready for Spring in a bespoke green outfit by Jenny Packham. While she's been able to fit into regular clothes throughout her pregnancy, the Duchess had today's ensemble custom-made to accommodate her bump.

Catherine, The Duchess of Cambridge convenes an early intervention for children and families symposium at Royal Society of Medicine on March 21, 2018 in London, England.

Catherine, Duchess of Cambridge will soon be stepping back from public duties ahead of the birth of her third child, pictured attending symposium at Royal Society of Medicine in London

Pregnant Kate Middleton is completing her final round of engagements before stepping back from public duties ahead of the birth of her third child

The Duchess of Cambridge, gave a cheerful wave to onlookers as she made her way to her car.

The Duchess of Cambridge looked ready for Spring in a bespoke green outfit by Jenny Packham, arriving for a conference held by The Royal Foundation in London

Pregnant Kate was seen placing a hand on her baby bump as she left the event in London

Catherine, Duchess of Cambridge departs The Royal Society of Medicine on March 21, 2018 in London, England.

The Duchess of Cambridge leaves after attending symposium of leading academics and charities championing early intervention into the lives of children at the Royal Society of Medicine in London.

Catherine, Duchess of Cambridge gave a speech saying teenagers should be taught parenting and relationship skills so they could be prepared in later life

The Duchess of Cambridge, addresses a symposium she convened with The Royal Foundation on early intervention for children and families. Mental health in childhood is one of Kate's areas of special interest.

Catherine, Duchess of Cambridge speaks at a symposium she has organized on early intervention for children and families with The Royal Foundation at the Royal Society of Medicine on March 21, 2018 in London, England.

The Duchess of Cambridge was seated alongside Peter Fonagy (not seen), chief executive of the Anna Freud Center.

Catherine, Duchess of Cambridge arrives for a symposium she has organized on early intervention for children and families at the Royal Society of Medicine on March 21, 2018 in London, England.

Catherine, Duchess of Cambridge arrives for a symposium she has organized on early intervention for children and families at the Royal Society of Medicine on March 21, 2018 in London, England.

The Duchess of Cambridge received a warm welcome from Sir Simon Wessely (left), president of the Royal Society of Medicine, Lorraine Heggessey, chief executive of the Royal Foundation and Peter Fonagy, chief executive of the Anna Freud Centre

The Duchess of Cambridge, has had a busy start to the year so far and is completing her second to last engagement before the birth of her third child

Catherine, Duchess of Cambridge attends an early intervention for children and families symposium at Royal Society of Medicine on March 21, 2018 in London, England.

Catherine, Duchess of Cambridge (L) was greeted by Lorraine Heggessey, chief executive of the Royal Foundation and Peter Fonagy, chief executive of the Anna Freud Centre