In the seventh week of Fortnite Battle Royale Season 7 there is an additional star 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 7.
Where is the star hidden in week 7?
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.
In the picture we see the ice king on his throne. The hint is hidden on the left half of the picture, behind ice crystals.
So go to the Ice King’s Throne in Polar Peak, south of the frozen lake (C7).