The Duchess of Cambridge made a surprise appearance at the Paddington station in London and found herself dancing with a life-size Paddington Bear.
The three royals joined the cast of the Paddington 2 movie and met 130 children from the 30 organizations supported by their charities forum.
Kate was not expected to attend the event and has been keeping a low profile.
Pregnant Kate was pretty in a pink three quarter length sleeve dress by Orla Kiely.
The dress was detailed with pink raised flowers, a black neckline trim and a contrasting black bow detail around the waist.