Rachael Harris is moving in to Cougar Town.

As first reported by Entertainment Weekly, the actress (who has guest-starred on CSI, Desperate Housewives and appeared in The Hangover) will play the possibly recurring role of Shanna, Courteney Cox’s new nemesis.

In related casting news: Alan Ruck - who’s currently appearing on FlashForward - has been cast as her husband, Frank. He'll crush on Cox’s Jules, further inciting the Jules-Shanna feud.

Matt Richenthal is the Editor in Chief of TV Fanatic. Follow him on Twitter and on Google+.