Princess Diana's niece Lady Kitty Spencer finally reveals her daughter's name - almost four months after announcing her surprise baby

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Princess Diana's niece Lady Kitty Spencer has revealed her baby daughter's name.

The eldest daughter of Earl Spencer, 33, announced she had secretly given birth to her first child with husband Michael Lewis, 65, in March.

Although Kitty didn't confirm her baby's gender in her Mother's Day post, her younger sister Lady Eliza gushed about her 'perfect little niece' in the comments. 

Over the weekend, the proud mother shared a new photo of her daughter on Instagram - and revealed her name to her 713,000 in the caption. 

The black-and-white image showed Kitty kissing her daughter's head as she took on a windowsill.

Pictured: Lady Kitty Spencer and her daughter Athena. The proud mother announced her daughter's name by sharing this black-and-white image on her Instagram

The proud mother wore a lace-trimmed shirt for the portrait while her daughter was dressed in a bee-print dress.

The image was taken by London-based photographer Susheel Schroeder, who has previously taken portraits for British Vogue's beauty director Jessica Diner and reality star Vogue Williams.

Lady Kitty captioned the image: 'Athena watching the world go by.'

The post has amassed over 32,000 'likes' in the past 24 hours - and fans gushed over the 'beautiful' moniker.

One wrote: 'Oooh darling... Athena is so gorgeous!! Like her mama.'

'Congratulations,' another added. 'She is so precious. I love her name.' 

'What a fantastic Greek name,' a third said.

Kitty's sister Lady Amelia added: 'Perfect angel.'  Meanwhile, Lady Eliza wrote: 'Puppy!'

For her main wedding dress, Kitty opted for a high-neck, Victorian-inspired white lace gown featuring feminine puff sleeves and a cinched waist

Pictured: Lady Kitty Spencer, 33, poses on a beach with her baby daughter Athena earlier this year

Lady Kitty, 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 bride, a Global Brand Ambassador for Dolce & Gabbana, wore five gowns by the designer over the weekend.

For her main wedding dress, Kitty opted for a high-neck, Victorian-inspired white lace gown featuring feminine puff sleeves and a cinched waist. The design drew inspiration from her mother Victoria Lockwood's own wedding dress with its button-down front.

Designer and co-founder of the fashion house, Domenico Dolce later said of Kitty's wedding wardrobe: 'She told us she had thought of us immediately, and we were very happy with that!'

'They've been beautiful and emotional moments,' said Dolce. 'One of the inspirations is definitely her love for Italy. Kitty is in love with our beautiful country and its rich history, art and culture.'

Stefano Gabbana said: 'But she is also a girl who is very attached to her origins, to England; to her heritage of the great Victorian era. And like all the English people, she has a great passion for all kinds of flowers.'

Pictured: Lady Kitty Spencer's parents Earl Charles Spencer and Victoria Lockwood on their wedding day in September 1989

The famous Spencer Tiara worn by Princess Diana was missing from the ceremony. Instead, Kitty opted for an elegant veil, intricate headpieces and flower crowns that each complemented the respective gowns.

The couple exchanged vows in between floral arches. Music was provided by a pianist and a singer positioned to the right of the couple.

Mr Lewis wore a kippah, and it is thought Lady Kitty received instruction in the Jewish faith ahead of the ceremony.

The smiling newlyweds walked back down the aisle hand-in-hand as guests tossed pastel-coloured confetti in the air.

The celebrations continued into the evening with dancing and a live band and the night ended with a spectacular fireworks display.

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 Charles, the 9th Earl Spencer and his first wife, Victoria Lockwood, divorced.