The hunky "Melrose Place" star moves into a new zip code.

The CW announced today that ROB ESTES will be joining the ever-growing cast of "90120."

Rob plays Harry, husband to LORI LOUGHLIN and son to JESSICA WALTER. He signs on as the principal of West Beverly High, his alma mater, after he moves his family from Kansas back to Beverly Hills to take care of his aging alcoholic mother, Tabitha (Walter).

Here is the breakdown of the cast so far:

SHENAE GRIMES -- Annie Mills, one of the core teenagers on the show, whose family has relocated to the 90210 zip code from Kansas.

LORI LOUGHLIN -- Celia Mills, a former Olympic medalist and mother of Annie and adopted son Dixon.

TRISTAN WILDS -- Dixon Mills, the adopted brother of Annie Mills who makes the move to Beverly Hills with his family.

JESSICA STROUP -- Silver, Annie's classmate who produces a YouTube-type video series.

JESSICA WALTER -- Annie's grandmother and Celia's mother-in-law Tabitha.

ANNALYNNE McCORD -- Naomi, who is hot, rich and one of the most popular girls in school.

MICHAEL STEGER -- Navid, a student at the high school, who heads up the school's daily on-air newscast, and makes friends with Dixon Mills, one of the two new kids in town.

DUSTIN MILLIGAN -- Ethan, a "likable, genuine ... star athlete."

RYAN EGGOLD -- teacher named Ryan.

Also, JENNIE GARTH will be making special guest star appearances as her original character, Kelly Taylor, who is now a guidance counselor at West Beverly High.