Reese Witherspoon as Jill Green
Jill Green is Rachel’s younger sister who makes her first appearance in Season 6, Episode 13 “The One With Rachel’s Sister” and the following episode, “The One Where Chandler Can’t Cry”. Jill arrives at Rachel’s apartment with the hopes of starting a new life for herself. Despite their onscreen rivalry, Jennifer Aniston and Reese Witherspoon are really close friends. The actresses will appear together in a new TV series for Apple TV+ called “The Morning Show” which will premiere this fall.