Lady Kitty Spencer Reveals She's a Mom in Mother's Day Post: 'The Joy of My Life'

Princess Diana's niece shared the happy news to mark Mother's Day in the U.K. on Sunday

Lady Kitty Spencer is a mom!

On Sunday, the 33-year-old niece of Princess Diana shared the surprise news in an announcement on Instagram to mark Mother’s Day in the U.K.

“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 🤍,” she captioned the post.

The announcement featured a video compilation of photos, beginning with two pictures of Kitty holding her baby on the beach while wearing a white swimsuit and white shirt draped off her shoulders. Meanwhile, another sweet snap showed Kitty holding her little one’s hand in the palm of her own.

“The most perfect angel in the world 🩷🩷🩷🩷🩷🩷,” Kitty’s younger sister, Lady Amelia Spencer, 31, wrote in the comments section. Amelia’s twin, Lady Eliza Spencer, added, “My perfect little Niece 🥰😍🩷,” confirming that the new addition to the family is a baby girl.

Related: Lady Kitty Spencer Shares the 'Proudest Moment of My Life' — and It Happened at Her Wedding!

Their younger brother, Samuel Aitken, also commented on Kitty's post with a single red heart emoji.

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Kitty’s happy news comes nearly three years after she tied the knot with her husband Michael Lewis, 65, in Italy. The couple married in front of friends and family at Villa Aldo Brandini in Frascati on July 24, 2021.

Related: See Lady Kitty Spencer's Most Glamorous Photos from Her Chic Honeymoon Tour of Italy

Kitty wore an intricate Dolce and Gabbana gown for her big day, which was attended by Viscountess Emma Weymouth and her husband Ceawlin Thynn, the Marquess of Bath, Sabrina Elba, pop star Pixie Lott and Made In Chelsea alum Mark Vandelli.

Lott, 33, also commented on Kitty’s Instagram post sharing her baby news and added, “Supermama 💘❤️❤️❤️ happy Mother’s Day 💓.”

Kitty and the millionaire fashion mogul also went on to honeymoon in Italy, a country that holds a special place in Kitty's heart.

She studied in Florence for three years and told the London Evening Standard in 2021 that "the love and passion I feel for life is ignited in Italy. I hope to have a proper base there someday and it is certainly where I would like to retire."

Kitty's happy news comes as her father, Charles Spencer, is sharing the harrowing details of his time as a student in a British boarding school in his new memoir, A Very Private School.

In an exclusive excerpt published by PEOPLE on Sunday, Spencer, 59 — the younger brother of Princess Diana — revisited the sexual and physical abuse he endured at exclusive Maidwell Hall school in Northamptonshire, England.

"The effect of what she did to me was profound and immediate, awakening in me basic desires that had no place in one so young," he wrote about the moment he was sexually abused by a 19 or 20-year-old assistant matron at the school at the age of 11.

The 9th Earl Spencer's memoir will be released on March 12.

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