A well-wisher, Peggy McEachrom, appeared delighted to meet the Duchess and said: "You're a fat lady", referring to Meghan's baby bump.
Last week the animal charity Mayhew was announced as one of four charity patronages that Meghan has taken on that reflect her passions and interests.
"She asked about Minnie's story, what she's like and if she's up for adoption?"
In a surprise move, the mother-to-be dressed her bump in a $45 turtleneck mini dress by H&M which comes in both beige and grey.
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The Duchess of Sussex visited an animal shelter charity in north London - for which she has just become patron - in a £24.99 dress from H&M.
The Duchess is a proud dog lover, having previously supported various animal rescue centres in her home city of Los Angeles.
In September past year, Meghan and Prince Harry adopted a black labrador rescue dog named Oz, to join them in their Nottingham Cottage at Kensington Palace.
The charity was founded in 1886 and today sees itself as an animal welfare social worker, keeping cats and dogs, whether family pets or companions for the homeless, safe and well alongside their owners, and supporting communities.
One picture showed the Duchess snuggling up next to her two dogs, Guy and Bogart, who appeared to be sleeping cosily next to Meghan.
In addition to Mayhew, the Duchess of Sussex is also the patron of Smart Works, a charity that helps women get back on their feet, the National Theatre and the Association of Commonwealth Universities.