Head's Together Christmas Party..

The Duke and Duchess of Cambridge and Prince Harry attended a Christmas party in support of their Heads Together campaign.

photo via The Daily Mail

It was an appropriate engagement to end 2016 on - a year in which they have focussed on mental health charities and their campaign to de-stigmatise mental health.

photo via The Daily Mail

They met with the youth support service, The Mix, and had the opportunity to celebrate those who support people with mental health issues.

photo via The Daily Mail

The trio then joined in with more festive activities - including making decorations.

photo via The Daily Mail

The Duchess looked very festive in the Vanessa Seward Cai Floral-Print Jacquard Dress.

She wore the Gianvito Rossi Pumps in Black Suede and carried her Mulberry Bayswater Clutch.

The Duchess also wore her Alexander McQueen Glossed-Leather Belt.

She finished the look with the Catherine Zoraida Gold Fern Hoop Earrings.