The adorable Prince of Cambridge is now attending primary school at Thomas Battersea School, a private school in Battersea, South London.
Also at the event the expectant Duchess, who was dressed in a salmon-coloured lace Orla Kiely dress, danced with Paddington Bear on the platform of the station.
A black turtleneck and her always-flawless brunette waves polished off the look.
Tellingly, Kate even joked about adding to their brood during a royal event in Warsaw where she was presented with a soft toy created to comfort newborns.
The Duchess of Cambridge, Kate Middleton, is now three months pregnant.
Kensington Palace has confirmed that the #Duchess Of Cambridge, Kate Middleton, is due to give birth on April 2018.
Us Weekly exclusively revealed soon after that Kate, 35, initially planned to keep the news under wraps for a little while, but was forced to go public sooner because she is suffering from hyperemesis gravidarum, the same acute morning sickness she experienced while pregnant with Prince George, 4, and Princess Charlotte, 2.
Britain's Catherine, Duchess of Cambridge, dances with a person in a Paddington Bear outfit by her husband Britain's Prince William, Duke of Cambridge as they attend a charities forum event at Paddington train station in London on October 16, 2017.