Dior signs a number of global ambassadors every year. I think they sometimes have a product specific contract (like Depp and the Cologne or Mila Kunis and the bags) and others have more general modeling apparel contracts.
This year (2023) so far they have used 8 global ambassadors including Jimin, Robert Pattinson, Dilraba Dilmurat, Elizabeth Debicki, Jisoo, Anya Taylor-Joy, HAERIN, and Caleb McLaughlin.
I don't even recognize the names of half these people! It seems they usually have a few very famous names and then some other more niche people.