Denim Richards: Meet 'Yellowstone's Loyal Ranch Hand Colby Luke Grimes), the all-star cast really brings the modern Wild West to life. But let's not forget about the boys in the bunkhouse. Without the trusty ranch hands not only would no work get done, but who else would keep us laughing making fun of Jimmy ( Jefferson White) for being a mediocre cowboy? One of our favorite ranch hands is Colby, played by Denim Richards. Richards grew up in Orange County, California, and was not only a talented singer but an avid horseback rider. From an early age, it was clear that he was going to be a performer and he grew up not only singing but performing in musical theater. While it was a somewhat tough transition from the stage to in front of the camera, Richards did it and started booking TV roles after working on short films in college.