Debi Mazar is a lucky woman.

She starred alongside Adrian Grenier on Entourage; she'll be teamed with Maksim Chmerkovskiy on season nine of Dancing with the Stars; and now she's nabbed a recurring role opposite Nathan Fillion in Castle.

As first reported by Entertainment Weekly, Mazar will appear on the second season of his ABC series as Paula Haas, Richard Castle's book agent. She'll debut in October by making Castle an intriguing offer.

Accepting this proposal, tough, will a rift in his relationship with Detective Beckett. Interesting...

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