You are looking for the secret battlestar in Fortnite Week 9? If you have done all the challenges of the 9th week, you unlock a secret loading screen. This gives you a clue to the hidden battlestar.
Complete all the challenges of Week 9, Season 6 and find the star
Where is the star hidden in week 9? In the picture you can see Calamity and Darkfire on a flower meadow. In the background you can see a barbecue, there is hidden the hint. So you have to look for a grill, which is at Leaky Lake. The exact nFundort of the gehjeimer star you see below in the video.
Remember, the extra star only appears when you have completed all challenges this week!