90210 Season 5 Episode 18 A Portrait of the Artist As a Young Call Girl: ANNIE IS FORCED TO REVEAL SHE IS AUTHOR X — Jordan (guest star Robbie Jones) asks Naomi (AnnaLynne McCord) to plan a launch party for the latest hot writer, known as Author X, which forces Annie (Shenae Grimes) to admit that she is Author X. Silver (Jessica Stroup) worries that Adrianna (Jessica Lowndes) is not okay that she is dating Mark (guest star Charlie Weber). Meanwhile, Dixon (Tristan Wilds) finds out that Michaela (guest star Lyndon Smith) has feelings for Navid (Michael Steger). Matt Lanter, Trevor Donovan also star. Bethany Rooney directed the episode written by Scott Weinger (#518).