Sarah Chalke (/ˈtʃɔːk/; born August 27, 1976) is a Canadian-American actress known for portraying Dr. Elliot Reid on the NBC/ABC comedy series Scrubs, the second Rebecca "Becky" Conner on the ABC sitcom Roseanne, Stella Zinman in the CBS sitcom How I Met Your Mother, and Beth on Adult Swim's adult animated science fiction series Rick and Morty. She has also had a recurring role in the third season of the ABC/TBS sitcom Cougar Town.