Michael Ausiello
September 01, 2009 AT 03:14 PM EDT

Debi Mazar’s Dancing With the Stars debut is still three weeks out, but the actress has already won a pretty nifty prize from ABC: a recurring stint on Castle.

Sources confirm to me exclusively that Mazar is joining the second-year dramedy as Paula Haas, book agent to Nathan Fillion’s modern-day Jessica Fletcher. She’ll first appear in October when she makes Castle an offer he’ll find hard to refuse. Accepting said offer, however, would cause a fair amount of upheaval in his life, particularly his relationship with Detective Beckett.


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