MONDAY, JULY 19

"90210" - (8:00-9:00 p.m. ET)

"What's Past is Prologue" (TV-14) (HDTV)

RUMER WILLIS AND GREG VAUGHAN GUEST STAR - Gia (Rumer Willis) encourages Adrianna (Jessica Lowndes) to audition for a new band and admits she has a crush on Adrianna. Dixon's (Tristan Wilds) birthmother, Dana (guest star April Parker Jones, "Jericho") drops by for a surprise visit and tries to develop a relationship with her son. Silver (Jessica Stroup) and Teddy (Trevor Donovan) go on their first official date but Silver finds it difficult to deal with Teddy's playboy past and enlists Naomi's (AnnaLynne McCord) help to track his whereabouts. Navid (Michael Steger) returns from his suspension to find that Naomi has started a gossip segment during Blaze News, which he adamantly opposes. Navid decides to get back into the dating scene by asking Lila (guest star Amber Wallace, "The Vampire Diaries") out on a date, his first since breaking up with Adrianna. Annie (Shenae Grimes) realizes that Jasper (Zach Sherman) has started following her around town. Debbie (Lori Loughlin) confides in Kai (guest star Greg Vaughan, "General Hospital"), her yoga instructor, about the arrival of Dixon's birthmother. Rob Estes also stars. Norman Buckley directed the episode written by Daniel Arkin (#215).