Prince Louis celebrates his first birthday on Tuesday, and new portraits of the young royal have been released to celebrate the milestone.

Prince Louis is the third child of the Duke and Duchess of Cambridge, Prince William and Kate Middleton, and they shared some adorable photos of him on their Kensington Palace Instagram account ahead of his birthday.

The first post featured two pictures of Prince Louis smiling and playing on the grounds in their Norfolk home, where the family spent Prince George and Princess Charlotte's school break, and they were taken by his mum Kate.

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"The Duke and Duchess of Cambridge are delighted to share these new photographs of Prince Louis ahead of his first birthday tomorrow," the caption reads.

"The photographs were taken earlier this month by The Duchess at their home in Norfolk."

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A second post was more of a portrait-style image of the toddler. The image was captioned, "Happy Birthday Prince Louis!"

As one royal baby celebrates his birthday, another is expected to arrive very soon with Meghan Markle due to give birth to her first child with Prince Harry any day now.

The Duke and Duchess of Sussex welcomed Meghan's mum Doria Ragland to the UK, with a source telling The Sun, "She wants to spend as much time as possible with her first grandchild and has come over for a sustained period of time"

Prince Harry and Meghan will welcome their first child almost a year on from their May 2018 wedding

Prince Harry and Meghan recently announced plans to keep the arrangements around the birth of their child private.

"Their Royal Highnesses have taken a personal decision to keep the plans around the arrival of their baby private," they said in a statement.

"The Duke and Duchess look forward to sharing the exciting news with everyone once they have had an opportunity to celebrate privately as a new family."