Season 4 Episode 7

full size Adrianna and Dixon Dance on 90210 Season 4, Episode 7: "It's the Great Masquerade, Naomi Clark"
Credit: Michael Desmond/The CW ©2011 The CW Network

Title: It's the Great Masquerade, Naomi Clark
Air Date: November 1, 2011 at 8:00 PM PDT

Naomi (AnnaLynne McCord) throws an all-campus costume party with her archnemesis Holly (guest star Megalyn Echikunwoke), leading to unfortunate consequences. Navid's (Michael Steger) plan to bring down his Uncle Amal (guest star Anthony Azizi) doesn't quite work out, and Silver (Jessica Stroup) learns that political candidate Marissa Harris-Young (guest star Brandy Norwood) is not who she seems. Adrianna (Jessica Lowndes) handcuffs herself to Dixon (Tristan Wilds) in an attempt to get him to stay sober, and Annie (Shenae Grimes) must decide if she wants to give Patrick (guest star Chris L. McKenna) another chance.