Kate, who is the patron of the Rugby Football Union, will host a special reception for the rugby team to celebrate their Rugby World Cup win.
The event will take place on Thursday, following a tour of the castle for the players and their staff.
Kate, who supported the team from the stands during the tournament, will greet the new world champions along with their hard-earned trophy.
In September, the Red Roses triumphed over Canada in the final match, winning 33-13 in front of a sold-out Allianz Stadium and a record audience of 81,885 spectators.
Following their victory, the prince and princess of Wales extended their congratulations.
The impact of the team’s triumph was acknowledged in the New Year Honours, with players Marlie Packer, Zoe Aldcroft, and coach John Mitchell being appointed OBEs, and Ellie Kildunne, Sadia Kabeya, and Megan Jones being appointed MBEs.
Kate joined the team in their post-win celebrations in the changing room after their pool match against Australia.
