Kate participated in icing a gingerbread house at the party, while also joining William and Harry, 32, in making Christmas decorations.

The Duke joins in the party and gets stuck into creating a bauble masterpiece. #HeadsTogether pic.twitter.com/GQN8bPMeo6

— Kensington Palace (@KensingtonRoyal) December 19, 2016

Next up, it wouldn't be Christmas without some paper decor! ??#HeadsTogether pic.twitter.com/zzoFPbxpKN

— Kensington Palace (@KensingtonRoyal) December 19, 2016

The royal trio presented the award for The Mix's volunteer of the year. They also heard from staff members who participate in online and telephone counseling at The Mix.

The Duchess joins a live online chat about counselling with volunteers and young people from around the UK. #HeadsTogether pic.twitter.com/YCiOHXftft

— Kensington Palace (@KensingtonRoyal) December 19, 2016

Their Royal Highnesses present George Yeorghaki with a Volunteer of the Year Award at the party - congratulations George ?? #headstogether pic.twitter.com/pvosF2By3Y

— Kensington Palace (@KensingtonRoyal) December 19, 2016

William, Kate and Harry have made mental health a prime component of their charitable work and launched the Heads Together campaign last spring to encourage young people to ask for help when life's challenges seem overwhelming. The campaign seeks to raise awareness and de-stigmatize mental health.

William and Kate will spend Christmas with their young children, Prince George and Princess Charlotte, in Bucklebury with Kate's parents and siblings instead of at Sandringham with Queen Elizabeth II. Harry is expected to celebrate Christmas with the royal family at Sandringham.

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