<P> `` Valley Girls '' provides insight on the mysterious past of character Lily van der Woodsen ( played by Kelly Rutherford as an adult and Brittany Snow as a teenager ) through a series of flashbacks to her life as a teenager in the 1980s . In the past , Lily runs away from her wealthy parents to live in the San Fernando Valley with her sister Carol Rhodes ( Krysten Ritter ) , the black sheep of the family . In the present , Lily 's daughter Serena van der Woodsen ( Blake Lively ) rebels against her mother while her classmates prepare for the Prom . The episode introduces the main cast of Valley Girls as guest actors . </P>
<P> `` Valley Girls '' provides insight on the mysterious past of character Lily van der Woodsen ( played by Kelly Rutherford as an adult and Brittany Snow as a teenager ) through a series of flashbacks to her life as a teenager in the 1980s . In the past , Lily runs away from her wealthy parents to live in the San Fernando Valley with her sister Carol Rhodes ( Krysten Ritter ) , the black sheep of the family . In the present , Lily 's daughter Serena van der Woodsen ( Blake Lively ) rebels against her mother while her classmates prepare for the Prom . The episode introduces the main cast of Valley Girls as guest actors . </P>
who plays young lily bass in gossip girl
who plays young lily bass in gossip girl
Brittany Snow
Brittany Snow