Sierra/Affinity has added Pam Grier, Alisha Boe, Phyllis Somerville, Charlie Tahan, Bruce McGill, Rhea Perlman and Celia Weston to its cheerleading comedy “Poms.” Diane Keaton and Jackie Weaver are already set to star in “Poms,” which has begun principal photography in Atlanta, Ga. Zara Hayes is directing from a script by Shane Atkinson based on a […]