Prince William and Duchess Catherine have released an additional photograph of Prince Louis.

The royal couple - who also have kids Prince George, four, and three-year-old daughter Princess Charlotte - have dropped another adorable image of their two-month-old son, pictured with a beaming smile while being held by his mother, following the youngster's christening.

The photo - captured by Matt Porteous - was released on the official Kensington Palace Twitter account, and the caption reads: ''The Duke and Duchess of Cambridge have released an additional photograph taken following the christening of Prince Louis.

''The Duke and Duchess hope that everyone enjoys this lovely photograph of Prince Louis as much as they do. (sic)''

William, 36, and 36-year-old Catherine's latest snap comes after they released four official photographs, taken by photographer Matt Holyoak, on Sunday (15.07.18) evening.

A Kensington Palace tweet read: ''The Duke and Duchess of Cambridge have released four official photographs to mark the christening of Prince Louis on Monday 9th July.

''The photographs were taken by Matt Holyoak at Clarence House, following Prince Louis's christening. (sic)''

The first image shared on the social networking site was a big family photo featuring the Duke and Duchess of Cambridge; George, Charlotte, and Louis, William's brother Prince Harry and his new wife Meghan, the Duchess of Sussex, Catherine's sister Pippa Middleton and her husband James Matthews, and both sets of Louis' grandparents.

Another picture featured Louis' immediate family, with George sporting a huge grin while sitting on his father's knee, and there is a third photo of the family of five.

William, George and Charlotte can be seen looking into the camera with a delighted Catherine cradling Louis in her arms and looking down at the youngster.

The fourth picture also saw Catherine holding onto Louis - who was baptised by the Archbishop of Canterbury in a private ceremony at the Chapel Royal at St James' Palace on July 9 - while she gazed into his eyes.