On Saturday, Kate attended her childhood friend Sophie Carter's wedding to fiancé Robert Suggs at St Andrew’s Church in Letheringsett, Norfolk.
The Duchess made a smart outfit choice, and re-wore a stunning blue Catherine Walker number to match her friend's blue wedding theme.
Kate previously donned the same blue dress in July last year, during a royal visit to Berlin with her husband Prince William, and children Prince George and Princess Charlotte.
The Duchess of Cambridge is known for recycling fashion pieces, and has previously re-worn outfits throughout various royal engagements.
Kate honoured her friendship to Ms Carter as she helped the young bridesmaids and page boys fulfil their wedding duties for the day.
Princess Charlotte and Prince George, were appointed as a bridesmaid and a page boy for the ceremony.
Ms Carter, who is Princess Charlotte's godmother, has been friends with Kate for over 10 years.
Kate stunned in a periwinkle Catherine Walker dress for her friend Sophie Carter's wedding (Image: NC)