Prince William, Kate Middleton and Prince Harry celebrated World Mental Health Day 2017 in Buckingham Palace. The Duchess wore Temperley London's Eclipse Lace Collar Dress in Iris.
The A-line dress is "a modern take on the lace dress underpinned by the season's Elizabethan influence". The dress features corded lace, scalloped edges, frilled sleeves and a black velvet neck tie.
Kate accessorized with simple black heels, stunning diamond earrings and ring and a black suede clutch from Mulberry. She wore very simple makeup and loose curls.
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The last time Kate stepped out in public, she wore a beautiful Prada dress during her visit to The Sunken Garden at Kensington Palace in remembrance of Princess Diana.

The Duchess, who is pregnant with her third child, has been out of the spotlight as of late due to her battle with Hyperemesis Gravidarum.