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Paris Hilton guest stars in this episode, in which Grady Bridges (Colin Hanks), handsome leading man of the popular TV soap opera "The Valley," invites his gushing fans Marissa (Mischa Barton) and Summer (Rachel Bilson) to a party in L.A. Coming along for the ride are Ryan (Ben McKenzie), who hopes to shield Marissa from learning about the affair between her ex-boyfriend Luke (Chris Carmack) and her mother, Julie (Melinda Clarke); and Seth (Adam Brody), who is just worried about losing Summer to the glamour and glitter of la-la land. This episode also includes a surprise confrontation with Kirsten's (Kelly Rowan) prodigal sister, Hailey (Amanda Righetti).