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The actress has agreed to guest star in an episode in November, Deadline says.
She is expected to play Bunny Dunbar, the mother of Russell (David Spade).
Meanwhile, former Eastwick and Less Than Perfect star Sara Rue has reportedly landed a recurring role as Brenda, Jeff and Audrey's new surrogate.
Rules Of Engagement continues on Mondays at 8.30/7.30c on CBS.
