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."

Lexie: [narrating] Grief may be a thing we all have in common, but it looks different on everyone.
Mark: It isn't just death we have to grieve. It's life. It's loss. It's change.
Alex: And when we wonder why it has to suck so much sometimes, has to hurt so bad. The thing we gotta try to remember is that it can turn on a dime.
Izzie: That's how you stay alive. When it hurts so much you can't breathe, that's how you survive.
Derek: By remembering that one day, somehow, impossibly, you won't feel this way. It won't hurt this much.
Bailey: Grief comes in its own time for everyone, in its own way.
Owen: So the best we can do, the best anyone can do, is try for honesty.
Meredith: The really crappy thing, the very worst part of grief is that you can't control it.
Arizona: The best we can do is try to let ourselves feel it when it comes.
Callie: And let it go when we can.
Meredith: The very worst part is that the minute you think you're past it, it starts all over again.
Cristina: And always, every time, it takes your breath away.
Meredith: There are five stages of grief. They look different on all of us, but there are always five.
Alex: Denial.
Derek: Anger.
Bailey: Bargaining.
Lexie: Depression.
Richard: Acceptance.