Kate Walsh Returning to Grey's Anatomy

Kate Walsh
Kate Walsh will return to Grey's Anatomy for an upcoming musical episode, TVGuide.com has confirmed.
While details on what Addison will be doing are scarce — the script isn't even finished — it's safe to assume that Derek's former wife will be helping Callie (Sara Ramirez) with her impending baby.
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Until then, Callie will be treated by Seattle Grace's OB-GYN, Dr. Lucy Fields, who will be played by Transformers star Rachael Taylor.
Walsh, 43, stars on ABC's Private Practice, a spin-off of Grey's Anatomy.
Grey's Anatomy returns with new episodes Thursday, Feb. 3 at 9/8c on ABC.