The festive look came with a neat bow and she kept to the color scheme by pairing it with red suede pumps.
Adding a slightly more personal touch, Kate accessorized with a pair of sapphire and diamond fringe earrings from the Queen's own collection, People reported. According to the publication, the earrings were once owned by the Queen Mother, who died in 2002.
Prince William, who arrived alongside his wife to support her on her big night, added his own festive style — his black suit popped with the addition of a bright red tie.
Her siblings, Pippa and James Middleton, as well as her mother Carole also made appearances at the carol service, which saw musical performances from Ellie Goulding, Leona Lewis, and Tom Walker, according to The Independent.
According to Town and Country, the Duchess of Cambridge included a personal message in the program for the evening. She wrote: "Christmas is a time when we can reflect on the past, listen to one another, focus on the relationships that nurture us and build our resilience, so we can look forward to a brighter shared future."
"My hope is that this Service creates a moment for us to do this together. Over the next hour we will celebrate the power of this time of year. And I wish you all the very best for the year ahead," Kate added.
"Together At Christmas" will be broadcast on ITV at 7:30 p.m. GMT on Christmas Eve.
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Representatives for Catherine Walker did not immediately respond to Insider's request for comment.
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