Here are 15 special moments captured as the second royal baby arrived.
London - Prince William and his wife Kate's second child will be fourth in line to inherit the British throne, behind her big brother Prince George.
The new birth will therefore cause everyone below the new royal baby to move down a place, starting with William's brother Prince Harry who has now dropped to fifth position.
The immediate line of succession to the throne includes Queen Elizabeth II's four children and their offspring.
Here is the list of royals who are next in line for the throne:
1. Prince Charles, Prince of Wales
Born in 1948, Prince Charles is the eldest son of Queen Elizabeth.
2. Prince William, Duke of Cambridge
Born in 1982, Prince William is Charles' eldest son.
3. Prince George of Cambridge
Born in 2013, Prince George is William's son.
4. Prince Harry, Prince Henry of Wales
Born in 1984, Prince Harry is Charles' second son.
5. Prince Andrew, Duke of York
Born in 1960, Prince Andrew is Queen Elizabeth's second son.
6. Princess Beatrice of York
Born in 1988, Princess Beatrice is Andrew's eldest daughter.
7. Princess Eugenie of York
Born in 1990, Princess Beatrice is Andrew's second daughter.
8. Prince Edward, Earl of Wessex
Born in 1964, Prince Edward is Queen Elizabeth's third son.
9. James, Viscount Severn
Born in 2007, James is Edward's son.
10. Lady Louise Windsor
Born in 2003, Lady Louise is Edward's daughter.
Queen Elizabeth's descendants are followed by those of her late sister princess Margaret, her only sibling.
The offspring of their father king George VI's siblings then follow, with more than 60 living people descended from his father king George V, who died in 1936.
The monarchy's website lists only the first 15 people in line, though some extensive counts reach around 2000 people eligible to inherit.
Drawn up in an era of religious strife, the Act of Settlement 1701, which sets out the succession laws, states that only Protestant descendants of Sophia of Hanover, the mother of king George I, can accede to the throne.
Some counts list more than 5700 living descendants of Sophia, including Roman Catholics who cannot inherit.
The highest person excluded on these grounds is 26-year-old Edward Windsor, Lord Downpatrick, a first cousin twice removed of the queen, who converted to Catholicism. He would otherwise be 35th in line.
A change to the succession laws which came into effect last month means males born after 28 October 2011 no longer take precedence over their older sisters.
Also people married to Catholics are no longer excluded, with Downpatrick's father George Windsor, the Earl of St Andrews, being restored to the line in 34th place.
The line is a vast tangle of nobility and ordinary, untitled descendants from all corners of Europe.
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