Jill Green (Reese Witherspoon): one of Rachel's two sisters, who arrives at Monica and Chandler's in "The One with Rachel's Sister", thinking Rachel still lives there. Their father has cut off Jill's supply of money and sent her to stay with Rachel, "the only daughter he's ever been proud of". She is vain, ditzy, materialistic and spoiled, a lot like her other sister Amy, but is a lot kinder towards Rachel and her friends. Rachel tries to train Jill in the ways of the world but, Jill just buys herself expensive things. She dates Ross to spite Rachel and is occasionally bewildered by quirks from both of them but leaves in the subsequent episode after Ross rejects her and she destroys his slide projector in her rage. Jill is mentioned in Season 10 when Amy gleefully reveals she has gotten fat, having gained fifteen pounds (a reference to Witherspoon's pregnancy).