watch 01:11 The Loop (TV) Do you like this video? Dorothy Diane "Dedee" Pfeiffer (born January 1, 1964) is an American TV and film actress. She plays Mary Ellen Jenkins in the episode "The One With The Pediatrician". She is also the younger sister of Michelle Pfeiffer. Retrieved from "https://friends.fandom.com/wiki/Dedee_Pfeiffer?oldid=69237" Categories: Actors Season 9 Actors One appearance Only Cast Community content is available under CC-BY-SA unless otherwise noted.