Rachael Harris

Comedian Rachael Harris has signed on to ABC's Cougar Town, TVGuide.com has confirmed.

Harris (The Hangover, The Jay Leno Show), 41, will play Shanna, a woman that the network describes as being the "nemesis" of Jules (Courteney Cox).

Watch Rachael Harris' take on the viral "21 Accents" video (warning: some coarse language)

Also joining the show is Alan Ruck (Ferris Bueller's Cameron, Spin City), who will play Frank, the husband of Harris' character, who has a crush on Jules. Ruck will split time between Cougar Town and FlashForward, on which he also appears.

Both castings were first reported by EW. The new characters will first appear in November, and are likely to recur.

Watch Harris on The Jay Leno Show

ABC just announced a full-season pickup for the Bill Lawrence-produced sitcom.