The Duchess of Cambridge visited a South London rehab centre on Tuesday to meet and speak to women recovering from addiction.
The mother-to-be, who has just returned from a holiday in Mustique, looked happy and healthy during her appearance at the Action on Addiction treatment centre in Clapham.
The 31-year-old, who is due to give birth in July, showed off the first signs of her compact baby bump in a grey belted MaxMara dress.
The Duchess of Cambridge is pictured arriving at Action on Addiction's Hope House in Clapham, South London, on Tuesday
Kate is a patron for the charity and spent the morning meeting women who are recovering from addiction and rebuilding their lives.
It is her first public engagement since she was photographed in a bikini during her Caribbean holiday earlier this month.
Nick Barton, chief executive of Action on Addiction, described her as an "intelligent" woman genuinely interested in the work of his organisation.
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The Duchess's visit comes following remarks made by Booker Prize winner Hilary Mantel, who describes the mother-to-be as a "shop window mannequin" with a "plastic smile", no personality and no purpose other than to produce an heir to the throne.
When asked for his reaction to Mantel's criticisms, Barton replied: "I don't think it's for me to comment on that kind of stuff - I speak of what I know, somebody who wants to help, is helpful and genuinely interested and is intelligent."
He added: "I've met her several times and I found her to be engaging, I found her very natural, I found her actually genuinely interested in the subject.
"You can tell a lot from people's questions and she asks really good questions. They're not routine stuff, they're questions of someone who wants to learn. I find her very easy to deal with."