Kate collars Princess Diana's look as she edits site for a day
The Duchess of Cambridge has been photographed wearing a blouse very similar in style to that worn by her husband's late mother, Princess Diana.
Diana wore the distictive piecrust collar-style sheer blouse when she visited Northern Ireland back in 1985.
Kate wore hers while spending a day at the Huffington Post website to highlight mental health issues.
She sat down to a morning conference in Kensington Palace with Huffington Post UK editor Stephen Hull, his staff and some of the mental health charities she is associated with.
Kate has commissioned articles, blogs and videos from leading figures in the mental health sector to raise awareness about the psychological well-being of the nation's children.
She called for the "taboo" on mental health to be broken.
The Duchess wrote: "The mental health of our children must be seen as every bit as important as their physical health.
"For too long we have been embarrassed to admit when our children need emotional or psychiatric help, worried that the stigma associated with these problems would be detrimental to their futures."
During her editorship she launched the Huffington Post initiative Young Minds Matter, which aims to encourage a wide-ranging discussion about children's mental health.
US First Lady Michelle Obama has written a blog for the site and she praised Kate for using her role as guest editor to "shine a bright light" on the issue of mental health.
Kate later joined four children who had been filmed for motivational videos posted on the news website under the title "Real Truth", about why adults should feel comfortable speaking to young people about their mental health.