Kate Middleton and Prince William attends Buckingham Palace Christmas lunch

Prince William, Catherine Duchess of Cambridge attended the Queen's Buckingham Palace Christmas lunch on Wednesday.

Tim Rooke/Rex/REX USA

Tim Rooke/Rex/REX USA

Tim Rooke/Rex/REX USA

Tim Rooke/Rex/REX USA

©James Whatling / Splash News

                            KATHERINE HOOKER Ascot Red Dress       MAPPIN & WEBB Necklace

Earrings date back to 2007, they were also worn by Catherine's sister - Pippa