Prince William, Kate Middleton and Prince Harry spread holiday cheer: All the highlights from their pre-Christmas party

'Tis the season for holiday parties! Kate Middleton, Prince Harry and Prince William helped spread cheer at the 2016 Heads Together and The Mix annual Christmas party, which celebrates volunteers and counselors who support people going through difficult times. Photo: Chris Jackson/Getty Images

The Duchess looked festive for the occasion sporting a floral-print jacquard dress by Vanessa Seward, which she paired with a Mulberry clutch and black suede Gianvito Rossi pumps. Photo: Samir Hussein/WireImage

The Duke of Cambridge was greeted with a warm hug from a young girl upon his arrival to the celebration. Photo: Samir Hussein/WireImage

The mom-of-two was gifted a beautiful bouquet of red and white roses by a young girl from The Harrow Club. Photo: Samir Hussein/WireImage

The royal trio looked cheery at the holiday event hosted by youth support service The Mix, which provides online and phone based support to 2 million young people every year. Photo: Twitter/@TheMixUK

The Duchess beamed as she chatted with staff and young individuals, who were decorating baubles. Photo: ALASTAIR GRANT/AFP/Getty Images

William tried his hand at bauble decorating while chatting to young volunteers. At the party, the royal admitted that his son has already begun unwrapping gifts from under the Christmas tree. Photo: ALASTAIR GRANT/AFP/Getty Images

The Duke was in the zone as he decorated a gingerbread house at the holiday party. Photo: Alastair Grant - WPA Pool/Getty Images

While Harry said goodbye to his girlfriend the day before the party, Meghan Markle wasn't too far from the royal's thoughts. The Prince wore the couple's matching his and her beaded bracelets to the event. Photo: Alastair Grant PA Wire/PA Images

Prince George's mom shared a laugh with a young woman as she took part in holiday activities at the party. Photo: ALASTAIR GRANT/AFP/Getty Images

Kate participated in a live online chat about counseling with volunteers and young people from around the UK. Photo: Twitter/@kensingtonroyal

The royals joined group sessions to hear from young people about their experience with The Mix's services. Photo: Alastair Grant - WPA Pool/Getty Images

Princess Charlotte's mom showed off her crafty side creating holiday decorations out of paper. The royals and volunteers added words of support to the paper chains. Photo: Twitter/@kensingtonroyal

Harry, Kate and William presented George Yeorghaki, who has been volunteering with The Mix UK for eight years, with the Volunteer of the Year Award at the Christmas party. Photo: Twitter/@kensingtonroyal