In 2018, Kevin Costner began starring on the modern-day western "Yellowstone," where he plays John Dutton. Co-star Kelly Reilly opened up recently about what it's like to work closely with Costner.

In addition to their general camaraderie, Reilly has great respect for the legendary actor, who sometimes leaves her in awe. Reilly adds that Costner is “one of the nicest, most generous actors” she knows.

Other actors on “Yellowstone” have nothing but praise for Costner as well. Luke Grimes has gushed about his “passion for the work,” and Cole Hauser calls him a “wonderful person.”