She wore a jumper from Zara, with fashionable balloon style sleeves.
The Duchess is a fan of the silhouette, and has a dress in a very similar style.
She wore the dress in red to visit Port Talbot in South Wales.
Kate Middleton and Meghan Markle are two very different Duchesses.
Her habit of releasing sweet images of her children on special events has been praised by a royal expert.
Royal expert Angela Mollard said on the ROYALS podcast: “As we know, every year on their birthdays, Kate tends to release photographs.