Kate Walsh to Appear in Latest Grey's Anatomy Crossover!

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Kate Walsh is going back where it all began.

The Private Practice star, whose character played a huge role in the second and third seasons of Grey's Anatomy, is headed back to Seattle Grace in a spring episode.

TV Line suggests this may be an ominous sign for Callie's baby, as Addison will be summoned to Seattle March 31 for the purpose of helping out with a medical crisis.

Calzonasloan's child seems the likely case.

Mark on Private Practice!

Addison and Mark last season, during Eric Dane's baby-related crossover.

The good news, at least according to what we've gathered, is that the baby won't be lost like others on Grey's Anatomy. So don't expect a miscarriage this time. Phew.

Then again, just because there's no miscarriage doesn't mean there won't be complications (or tragedy) once the little guy/girl is born. Hopefully not, but it's possible.

For now, we don't know much else about Addison’s latest trip up the coast ... and we can only imagine her reaction upon learning Mark's role in this unusual situation.

Excited to see her? How do you see it playing out? Comment below!

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.

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Grey's Anatomy Quotes

MEREDITH: "You don't get to call me a whore. When I met you, I thought I had found the person that I was going to spend the rest of my life with. I was done! All the boys and all the bars and all the obvious daddy issues, who cares? I was done. You left me. You chose Addison. I'm all glued back together now. I make no apologies for how I chose to repair what you broke. You don't get to call me a whore."
DEREK: "This thing with us is finished. It's over."
MEREDITH: "Finally."
DEREK: "Yeah, it's done."
MEREDITH: "It is done."

There's a reason I said I'd be happy alone. It wasn't 'cause I thought I'd be happy alone. It was because I thought if I loved someone and then it fell apart, I might not make it. It's easier to be alone, because what if you learn that you need love and you don't have it? What if you like it and lean on it? What if you shape your life around it and then it falls apart? Can you even survive that kind of pain? Losing love is like organ damage. It's like dying. The only difference is death ends. This? It could go on forever.

Meredith