Piper Perabo has joined “Grey’s Anatomy” for a three-episode run in Season 21. Perabo, a Golden Globe nominee whose credits range from “Coyote Ugly” to “Yellowstone,” will play Jenna Gatlin, a fierce mother who will do anything for her 9-year-old daughter Dylan, who is at Grey Sloan for a high-risk brain surgery. Perabo first appears […]