Kate and William, both 35, announced that they were pregnant back in September - but as they didn't confirm exactly how far gone Kate was, the due date remained unclear.
It was her first public appearance since announcing her third pregnancy.
We weren't expecting to see her again so soon because Kate has been suffering from extreme morning sickness, like she did with her previous two pregnancies, but less than a week later she's stepped out again-to dance with Paddington Bear. Kate, sporting a new hair style, danced with Paddington Bear on the platform of Paddington Station in London. Mahira, who described the royal encounter as "mind-blowing", said: "I asked her what's it like to be a princess, because I'd like to be one, and she said her favourite thing was meeting special people like us".
Even if the Duchess is miserable, she won't let anyone know it.
The Duchess of Cambridge's pregnancy was announced over a month ago, but the time scale of the pregnancy had remained a secret until now and prompted fevered speculation from fans of the royal family. Queen Elizabeth experts the younger generation to do as they are expected and fulfill all of their royal duties and obligations.
Kate suffered so badly when pregnant with Prince George, now four, that she was hospitalised and reportedly put on a drip to ensure she got the right nutrients.