Grey's Anatomy-Private Practice Spoilers: Mark & Addison Reunite; Meredith & Derek Engaged?

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TV Guide has the details on the February 12 and February 19 episodes of Grey's Anatomy, in which Private Practice characters Sam, Naomi, Addison and her brother Archer visit Seattle Grace after learning of Archer's serious brain condition.

Archer (Grant Show) first returns to Oceanside the previous episode, February 5. Looks like Addison and Mark will reprise their old ways - or at least flirt a bit in one episode.

Also, as reader Nikki points out, note the use of the term "fiance" below - are Meredith and Derek getting engaged? Will the proposal happen between now and February 12?

Check out the scan below for the details ...

Mark and Addison TV Guide Photo

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

COOPER: "It's wrong?"
NAOMI: "You need to meet a grown up. You need to date someone your own age."
VIOLET: "Someone without a porny internet name and perhaps no criminal past."
NAOMI: "A nice girl."
VIOLET: "A reliable girl."
NAOMI: "Someone who you can have a relationship with."
VIOLET: "You’re a respected doctor."
NAOMI: "Go out in the real world. Meet a woman your own age and go out."
VIOLET: "Be a man."

ADDISON: "You work with your ex-husband in a shrine for your ex-husband."
NAOMI: "It’s actually a good book. And we're friends. And we stayed friends after we divorced. It’s very healthy. We're healthy."
ADDISON: "What happened between you and Sam?"
NAOMI: "Addison, you and I were close in med school, but it was a long time ago."
ADDISON: "Oh, Naomi. Come on. You can’t stay mad at me forever. I know you."