The two royals will step out for the Ladies' Single Final at the Wimbledon Championships.
Before the match, Kate and Meghan will meet with former female tennis champions, and speak with ball girls and boys to learn what it's like to participate in the legendary tournament.
The Duchess of Cambridge and the Duchess of Sussex will then take their seats in the royal box to cheer on Angelique Kerber and Serena Williams - a close friend of Meghan's.
Kate and Meghan have already attended plenty of royal events together, but have always been accompanied by their husbands. This will be the duchesses first time just the two of them.
This week's New Idea Royals podcast delves into what REALLY happened at Prince Louis' royal christening.