Cape Town - This morning, she was fourth in line to the British throne.
This afternoon, her baby brother was born. But Princess Charlotte is still fourth in line to take the crown.
The little princess (2), will go down in history as the first female royal not to be pushed back in the line of succession by a younger male sibling, The Mirror reports.
Britain and royal fans all over the world were in raptures on Monday after the Duke and Duchess of Cambridge welcomed their third child into the world.
William (35) and Kate (36) are also parents to Prince George (4), who is third in line to the throne, behind his grandfather Prince Charles (68) and dad William.
Kate gave birth to the as yet unnamed prince just after 11:01.
The baby prince will be fifth in line to throne, ahead of his Uncle Harry (33), but behind Charlotte. The change is thanks to the Succession to the Crown Act, passed as recently as 2013.
"In determining the succession to the Crown, the gender of a person born after 28 October 2011 does not give that person, or that person’s descendants, precedence over any other person (whenever born),” the law states.
As if she knew, the newly minted Cambridge middle child was all sweet smiles and waves as she arrived at the Lindo Wing in London, to meet her little brother for the first time.
By comparison, George, still in his school uniform, looked rather overwhelmed by the crowds gathered outside St Mary’s hospital, tightly clutching his dad’s hand.
PICS: Prince George and Princess Charlotte meet their little brother
Kate, looking amazing as ever, and William made their first appearance with their newborn on the steps on the Lindo Wing at St. Mary's Hospital shortly after George and Charlotte were taken back to Kensington Palace.
Sources: Mashable, The Mirror, Legislation.gov.uk