In the third week of Fortnite Battle Royale Season 7 there is an hidden Battlestar, to unlock this extra star you must complete all the challenges of this week successfully.
Have you made all the challenges? If not, here is an overview of all challenges in week 3.
Where is the star hidden in week 3?
When you have completed all the tasks (7 in total) you will see a new loading screen. In this picture you can find the hint for the hidden star.
Look closely, next to the right elbow of Santa Claus Sergeant Winter you can see the star, in the background at the hangar.
Where can I find the secret star in week 3? Go to coordinates A8 / B8 and grab the extra star!