90210 is really bringing in the country star power this season.
Austin was introduced in the season premiere as a foil and possible love interest for Naomi (AnnaLynne McCord). We'll also meet Austin's cousin, played by American Idol's Kellie Pickler, later this season.
Cyrus, whose TV credits include Disney's Hannah Montana, will appear in an episode slated for November.
90210 airs Tuesdays at 8/7c on The CW.