Michael Ausiello
January 13, 2009 AT 08:33 AM EST

Well, what do you know — Addison has gone and made herself a new friend on Private Practice.

What About Brian‘s Amanda Detmer has booked a four-episode arc on the Grey’s spin-off playing a pregnant patient of Kate Walsh’s Addison, sources confirm to me exclusively.

But what begins as a strictly professional relationship gradually turns personal when the two strike up a friendship.

Look for Detmar to debut in March.

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