DENISE RICHARDS AND CARMEN ELECTRA GUEST STAR IN THE 100th EPISODE — Naomi (AnnaLynne McCord) hosts an elaborate charity lingerie show at the Playboy Mansion in an attempt to gain membership status with the elite ladies West Beverly alumni group. Silver (Jessica Stroup) surprises her West Beverly High friends by performing burlesque at this stylish Homecoming event. Liam (Matt Lanter) confides in Annie (Shenae Grimes) about Vanessa’s (guest-star Arielle Kebbel) accident and tells Annie about the blackmail threats he’s received. Liam also accepts Navid’s (Michael Steger) apology for leaking Liam’s sex tape and offers Navid the chance to manage The Offshore. While Dixon (Tristan Wilds) is making big plans for Adrianna’s (Jessica Lowndes) career on his new record label, he discovers that Ade had other desires aside from music. Harry Sinclair directed the episode written by Scott Weinger (#508).