As we count down the days (or hours, depending on what source you're reading), until Kate and husband Prince William become parents, take a look at her pregnancy in pictures in our gallery below.
Kate will give birth to her first child in the private Lindo Wing at St Mary's Hospital in Paddington, London; the same place that Prince William and his brother Prince Harry were born.
The child will be third-in-line to the throne after Prince Charles and Prince William.
Following tradition, the medical staff will sign an official birth announcement that will then be taken by a royal aide - via police escort - to Buckingham Palace where it will be attached to an easel, allowing us all to see whether it's a little Prince or Princess of Cambridge.
The Queen, Kate's parents and senior members of the royal family will be told beforehand.