Sarah Beth Lancaster (born February 12, 1980) is an American actress. She is known for her roles of Rachel in Saved by the Bell: The New Class and Madison Kellner on Everwood. She also had a recurring guest role on NBC’s Scrubs as JD’s love-interest, Lisa the Gift-Shop Girl, and played Marjorie in ABC’s TV series What About Brian. In 2005 she starred in the TV movie Living With the Enemy with Mark Humphrey. She currently appears in the TV series Chuck as Chuck’s sister Ellie Bartowski.