New photographs of Princess Charlotte, taken by her mother the Duchess of Cambridge, have been released to mark her first birthday.

The four photographs were taken in April at their family home in Norfolk.

Photographs of Charlotte at six months old were released in November. Photo: HRH The Duchess of Cambridge/ BBC

The princess, who turns one on Monday, is seen walking - with the aid of a baby walker filled with blocks - for the first time in one of the images.

The princess turns one on Monday 2 May. Photo: HRH The Duchess of Cambridge/ BBC

Kensington Palace said the Duke and Duchess of Cambridge were "delighted" to share the new pictures of Charlotte.

The princess was last seen in public at her christening last July - the first time the Cambridges had been seen as a family of four.

The family went on a skiing holiday earlier this year. Photo: John Stillwell/ BBC

Photographs of the princess have been released sporadically, the most recent before her birthday pictures being one in which she is sitting on her great-grandmother's knee to mark the Queen's 90th birthday last month.

She is seen walking in one of the images. Photo: HRH The Duchess of Cambridge/ BBC

The Duchess of Cambridge took a series of photographs in the weeks after Charlotte's birth, in which she is seen being cradled by brother Prince George, and another set to mark her daughter's six-month milestone.

‘IMPORTANT FAMILY MOMENTS’

Kensington Palace said the Duke and Duchess of Cambridge were 'very happy' to share the images. Photo: HRH The Duchess of Cambridge/ BBC

In March, the duke and duchess released a series of photographs taken on their skiing holiday to the French Alps.

Kensington Palace said in a statement: "The duke and duchess are very happy to be able to share these important family moments and hope that everyone enjoys these lovely photos as much as they do."

The princess was first seen in public on 2 May 2015 as she left the Lindo Wing at St Mary's Hospital in Paddington, west London. Photo: Dominic Lipinski/ BBC

The new photographs show Charlotte wearing a blue collared dress with matching tights and white cardigan, and a similar outfit in pink.

The duke, duchess, Charlotte and Prince George live at Anmer Hall, on the Queen's Sandringham Estate.

She was then pictured with her brother Prince George the following month. Photo: HRH The Duchess of Cambridge/ BBC