The mother-of-two, who is Prince William's auntie, was pictured visiting the NSPCC Service Centre. She is not attending the christening due to its 'intimate' nature.
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Sophie looked radiant as she met with staff and gave a speech wearing a cobalt blue wrap coat over a black shift dress and black knee-high boots. She accessorised with a snakeskin print clutch.
After weeks of speculation over the guest list, a spokesperson for William and Kate revealed earlier this month that the christening would be a "small, intimate affair".
"We are not giving details of the guest list at this stage," he said. "All we are saying is that it will be a small intimate affair with close family￼ and others, which include godparents."