The world's media camped outside St Mary's Hospital in London's Paddington for days as they awaited the news of the Royal birth.
Finally, on 22 July 2013, Kate gave birth to her baby boy in the hospital's private Lido Wing and the news caused a frenzy of celebrations around the world.
The following day, we got our first glimpse of the future King as the couple left hospital. After posing for pictures, William drove his wife and son home to Kensington Palace.
Prince William and Kate Middleton didn't have a name at first, but they later decided to call their boy George Alexander Louis.
First pictures of the Royal baby: Kate and William leave hospital