CinemaBlend Kelly Reilly has been a mainstay on the series Yellowstone since the first episode aired back in 2018. She stars on the hit cable series alongside Kevin Costner as his on-screen daughter, and she is a force to be reckoned with on the modern-day western. Now that filming has wrapped on Season 4, which has yet to debut on Paramount Network, Reilly has taken up a new role and it certainly sounds like a break away from her work as Yellowstoneâs Beth Dutton. Beth Dutton is strong, and at times, a pretty wild character. Having firmly found her footing as the highly opinionated TV sibling, Kelly Reilly almost completely flipped the script with her latest feature role as Isabelle in the period horror film