From George Clooney to Julia Roberts: The Best Guest Stars on Friends

It may be all about the core six, but the gang had many famous faces join them along the way

REESE WITHERSPOON

Rachel's sister Jill attempted to well, pull a Rachel, leaving home and vowing to stop using their father's credits cards in the season 6 episode "The One with Rachel's Sister." The whole thing blows up, however, when she tries to date Ross, eventually deciding to go back to a bankrolled lifestyle.