The Queen is known as Lilibet to those closest to her (Image: AFP via Getty Images)
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Meghan Markle and Prince Harry honoured the Queen as they named their baby daughter Lilibet Diana Mountbatten-Windsor.
The infant, who will be known as Lili, was named after the Queen and Harry's late mother, Princess Diana.
Lilibet is a nickname given to the then Princess Elizabeth as a toddler – because she was unable to pronounce her own name.
It continued to be used as she grew up, and the Duke of Edinburgh, who died in April, affectionately referred to his wife as Lilibet throughout their 73-year marriage.
The Queen reportedly signed notes to loved ones with the name, and poignantly a letter placed on Prince Philip's coffin was signed Lilibet.
The young princess was unable to pronounce her name, instead calling herself Lilibet – a nickname which stuck
(Image: Universal Images Group via Getty Images)
The nickname was given to her by King George V, her grandfather, when she was a young child.
There are several known examples when the sweet moniker has been used by the royals.
In a letter to her grandmother, Queen Mary, the young princess wrote: "Darling Granny. Thank you very much for the lovely doll's house. I do love it, and I have unpacked the dining room and the hall. Love from Lilibet xxx."
Her father, King George VI, famously said of his daughters, Elizabeth and Margaret: "Lilibet is my pride. Margaret is my joy."
And in a letter to the Queen Mother following their wedding, Prince Philip wrote: “Lilibet is the only ‘thing’ in the world which is absolutely real to me.”
Harry and Meghan yesterday announced they had named their child after the Queen
(Image: AFP via Getty Images)
The young Queen, pictured with her father, George VI in 1936
(Image: ddp images/United Archives)
Harry and Meghan are said to have told the Queen of their plans to name their baby girl after the Queen but officials at Buckingham Palace only found out about Lilibet's birth at 5pm on Sunday along with the rest of the world, reports The Sun.
The new arrival is a little sister for Archie, who was born in 2019, and a new cousin for Prince George, Princess Charlotte and Prince Louis.
A statement from the couple's press secretary said: "It is with great joy that Prince Harry and Meghan, The Duke and Duchess of Sussex, welcome their daughter, Lilibet "Lili" Diana Mountbatten-Windsor, to the world.
"Lili was born on Friday, June 4 at 11.40am in the trusted care of the doctors and staff at Santa Barbara Cottage Hospital in Santa Barbara, California.
"She weighed 7lbs 11oz. Both mother and child are healthy and well, and settling in at home.
The Queen and Prince Philip with Harry, Meghan, Archie and Meghan's mum Doria
"Lili is named after her great-grandmother, Her Majesty The Queen, whose family nickname is Lilibet.
"Her middle name, Diana, was chosen to honour her beloved late grandmother, The Princess of Wales.
"This is the second child for the couple, who also have a two-year-old son named Archie Harrison Mountbatten-Windsor.
"The Duke and Duchess thank you for your warm wishes and prayers as they enjoy this special time as a family."
The family have been living in the US since they quit the royal family last year.
But Harry retained his place in the line of succession so Lilibet will be eighth in line to the throne.
The first seven places remain unchanged – the Prince of Wales, the Duke of Cambridge, Prince George, Princess Charlotte, Prince Louis, Harry, and Archie Mountbatten-Windsor.
The Queen and the royal family said they were 'delighted' with the news.
A Buckingham Palace spokesperson said: “The Queen, The Prince of Wales and The Duchess of Cornwall, and The Duke and Duchess of Cambridge have been informed and are delighted with the news of the birth of a daughter for The Duke and Duchess of Sussex.”
The happy news comes after Meghan suffered a devastating miscarriage last summer.
The Duke and Duchess of Cambridge tweeted: "We are all delighted by the happy news of the arrival of baby Lili. Congratulations to Harry, Meghan and Archie."