Hugh Grosvenor, the Duke of Westminster and godson of King Charles, has welcomed his first child with his wife, Olivia Henson.
The couple, who married in June 2024, announced the birth of their new baby daughter and revealed her unique name.
Cosima Florence Grosvenor was born on Sunday July 27, her unusual first name being drawn from the Greek boy's name Cosimo.
An official statement released to celebrate her birth read: "The Duke and Duchess of Westminster are thrilled to announce the birth of their baby daughter.
King Charles's godson and his wife, Hugh Grosvenor and Olivia Henson, have welcomed their first child
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"They have named her Cosima Florence Grosvenor, who was born in London today, 27 July.
"Both the Duchess and Cosima are doing well.
"The Duke and Duchess now look forward to spending this special time together as a family," the statement concluded.
Hugh, 34, is the 7th Duke of Westminster and among one of the wealthiest men in Britain.
Cosima Florence Grosvenor was born to the couple on Sunday
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The Duke inherited his late father’s impressive fortune of around £9.5bn in 2016, now worth an estimated £10.6billion.
Olivia Henson, an aristocrat, is a descendant of Sir Richard Hoare, the founder of Britain's oldest bank C Hoare & Co.
The pair wed in the summer of 2024 at Chester Cathedral in a plush ceremony attended by the great and the good.
Prince William, a close friend of Hugh’s, was in attendance as an usher alongside Princess Eugenie.
The billionaire Duke is one of Britain's richest men
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Hugh’s close connection to Prince William led to him being named the godfather of Prince George.
He is also a godparent of Prince Harry and Meghan Markle eldest child, Prince Archie.
Hugh and Olivia announced that they were expecting soon after the wedding with a glowing statement.
"The Duke and Duchess of Westminster are very pleased to share that the Duchess is expecting a baby in the summer," the couple said.
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Hugh and Olivia married in the summer on 2024
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"The couple are delighted with the news and are very much looking forward to starting a family together," the statement finished.
After tying the knot, the couple have remained relatively private and only made a handful of public appearances.
Over Christmas, they visited charities supported by the Westminster foundation.
Looking ahead, Olivia hinted she and Hugh were looking to settle in Chester, saying they were: "slowly transitioning to move up from London and be much more permanent here and really putting roots down."