Lady Kitty Spencer reveals a rare glimpse of her daughter in a snap on sister Eliza's Instagram - after Princess Diana's niece surprised fans with baby announcement on Mother's Day

Princess Diana's niece Lady Kitty Spencer was the picture of a doting mother in a rare photograph with her daughter - who appears to be older than fans might expect.

Lady Kitty, 33, who is the oldest child of Diana's brother Earl Charles Spencer, announced she had welcomed her first child with her husband Michael Lewis as she marked Mother's Day on Instagram this year.

In a recent snap posted by Lady Kitty's sister Lady Eliza Spencer, 31, on the social media platform, the model could be seen sharing a sweet moment with her daughter.

The socialite, dressed in a chic white and black polka dot dress, holds her little one in her arms as they check out the vibrant floral displays at the Chelsea in Bloom show in London over the weekend, according to Hello!.

But it appears Lady Kitty gave birth earlier than many fans may have realised - after her Mother's Day post welcoming her little one included a stunning picture of the model holding her daughter as a baby on a beach. 

A source confirmed to MailOnline that Lady Kitty's daughter is already a year old.

Princess Diana 's niece Lady Kitty Spencer was the picture of a doting mother in a rare photograph with her daughter - who appears to be older than fans might expect

Princess Diana 's niece Lady Kitty Spencer was the picture of a doting mother in a rare photograph with her daughter - who appears to be older than fans might expect

Indeed, in the recent snap, Lady Kitty's tot looks older than just a couple of months as she sports an adorable cardigan, a blue striped garment and white shoes. Both mother and daughter look away from the camera as the photo's captured. 

Earlier this year, Lady Kitty attended the nuptials of her sister Lady Amelia Spencer, 31, whose wedding to long-term partner Greg Mallett took place in March 2023.

Lady Kitty only seemed to appear in one of the photographs made public of the special day in a collection released by Hello!. Dressed in an elegant one-shouldered dress, she stood slightly behind the bride in a snap alongside her sister Lady Eliza.

The exact date of when Lady Kitty gave birth is still unknown and the youngster's name is yet to be revealed. 

Sharing the sweet mother and daughter snap to her Instagram account recently, Lady Eliza wrote: 'Such a special morning with my girls @kitty.spencer.'

The model and her little girl were snapped as they viewed a The Very Hungry Caterpillar-themed display.

Lady Kitty, who is married to 65-year-old multi-millionaire Michael Lewis, shared a series of photos of her child with her surprised Instagram followers on Mother's Day in March 2024.

Lady Kitty, 33, who is the oldest child of Diana's brother Earl Charles Spencer , announced she had welcomed her first child with her husband Michael Lewis as she marked Mother's Day on Instagram this year

Lady Kitty, 33, who is the oldest child of Diana's brother Earl Charles Spencer , announced she had welcomed her first child with her husband Michael Lewis as she marked Mother's Day on Instagram this year

Lady Amelia Spencer (left), Lady Kitty Spencer (centre) and Lady Eliza Spencer (right) at a London Fashion Week party in 2021

Lady Amelia Spencer (left), Lady Kitty Spencer (centre) and Lady Eliza Spencer (right) at a London Fashion Week party in 2021

In the comments of her big sister's Instagram post, Lady Eliza Spencer gushed: 'My perfect little niece'

In the comments of her big sister's Instagram post, Lady Eliza Spencer gushed: 'My perfect little niece' 

The new mother didn't reveal her child's name or gender but gushed that she loved them 'unconditionally' in the caption.

She wrote: 'It’s the joy of my life to be your mummy, little one. I love you unconditionally. Happy Mother’s Day to those who celebrate today.'

Kitty's younger sister Lady Eliza left a sweet tribute to her new family member and revealed the baby's gender by writing: 'My perfect little niece.'

She finished off the comment with some heart emojis, while Eliza's twin sister Lady Amelia added: 'The most perfect angel in the world.' 

Her brother, Samuel Aitken, added a heart emoji, while society pal Emma Weymouth added a series of heart eye emojis.

Lady Kitty is a first cousin of Princes William and Harry, meaning the new baby will be second cousins to Princes George, Louis, Archie and Princesses Charlotte and Lilibet.

The socialite was raised in South Africa until her parents divorced when she was seven, after which she began spending her time between Cape Town and the UK (pictured in London in September 2021)

The socialite was raised in South Africa until her parents divorced when she was seven, after which she began spending her time between Cape Town and the UK (pictured in London in September 2021)

The 33-year-old, who works as a model for Dolce & Gabanna, tied the knot to South African multi-millionaire Michael Lewis, 65, three years ago.

The socialite, then 30, wed the multi-millionaire Michael Lewis at the Villa Aldobrandini in Frascati, a stunning country mansion with views out towards Rome, on July 24, 2021.

Having delayed their wedding for two years due to the pandemic, the celebrations stretched across three days and were attended by close friends including the pop star Pixie Lott and the Marchioness of Bath.

The model caught the eye of the business tycoon when they met through mutual friends in 2018 and got married in the sumptuous Italian wedding ceremony three years later.

But before she met her prince charming, Lady Kitty made a name for herself in the fashion world, as a spokesmodel for Dolce & Gabbana, who supplied five dresses for her wedding and walked in several Fashion Weeks across the globe.

Meanwhile, Michael knows a thing or two about fashion as well, being the chairman of the Foschini Group, which owns British high street chains Whistles and Phase Eight.

The tycoon is believed to be worth £80million, with a £19million property in London and another home in his native South Africa, where his wife grew up after her father Charles, the 9th Earl Spencer and his first wife, Victoria Lockwood, divorced.