When Summer and Marissa run into Grady Bridges, the star of Summer's favorite soap 'The Valley', he invites them to a party in Los Angeles. At the party, Summer is thrilled to spend time with Grady, but Seth is not as happy. The situation is reversed when Seth meets sexy Kate (Paris Hilton), and it's Summer's turn to be jealous. Additionally the gang run into Hailey, who is now working as a stripper. Jimmy and Sandy present their restaurant to Newport's finest and approach Caleb for some financial help. Meanwhile in heading back home Ryan has a hard time keeping Luke and Julie's affair a secret from Marissa.