PRINCE HARRY and Meghan Markle welcomed a baby girl into the world on Friday as they became parents for the second time.
Two days later, they revealed her name, Lilibet 'Lili' Diana Mountbatten-Windsor.
But what exactly does the name mean and why did the Duke and Duchess of Sussex choose it? Here's everything you need to know:
What does 'Lilibet' mean?
The name Lilibet is a tribute to Queen Elizabeth, Harry's grandmother.
It was a nickname often given to the Queen by her close relatives throughout her life. It's understood that her husband Prince Philip often referred to her 'Lilibet' throughout their 73-years of marriage.
Lilibet is derived from the name Elizabeth, which is originally Hebrew and roughy translates to 'God is my oath'.
Why was Queen Elizabeth known as 'Lilibet'?
Initially, Elizabeth was given the nickname by her grandfather, King George V.
As a little girl, Elizabeth apparently struggled to pronounce her own name, and 'Lilibet' was the closest she could get for a time. As such, her grandfather decided to imitate it, and the name stuck.
It's understood that the Queen has used the name Lilibet in letters when writing to close members of her family.
— The Royal Family (@RoyalFamily) April 19, 2016
Why did Harry and Meghan choose Lilibet?
They chose it to honour Harry's grandmother, although it's thought that she will go by the name 'Lili'.
In a statement announcing the birth of their new-born daughter, the couple confirmed the reason behind the name:
"Lili is named after her great-grandmother, Her Majesty The Queen, whose family nickname is Lilibet."
Why did they choose 'Diana' as a middle name?
This is in tribute to Harry's mother, the late Princess Diana, who died in car accident in 1997.
"Her middle name, Diana, was chosen to honour her beloved late grandmother, The Princess of Wales," their statement added.
Prince William's daughter, Charlotte, also has the middle name Diana, in honour of her grandmother.
What is Lilibet's last name?
Her last name, like her old brother Archie, is Mountbatten-Windsor.
This is the surname to honour both the Queen (whose official surname is Windsor) and Prince Philip (whose surname is Mountbatten).
The special surname was first created in 1960 following the couple's union and is the surname used by all four of the Queen's children.