This week on Grey's Anatomy, Derek (Patrick Dempsey) is officially moving with Meredith (Ellen Pompeo) and you know that's going to result in plenty of nakedness drama.

Case in point: The clip below from "Brave New World" ...

That's not all, though. Not only does McDreamy discover Ellis Grey's journal, but his presence in Meredith's house results in some major tension between her other roommates.

Elsewhere, George is fretting over whether he passed his test, and Callie is (awkwardly) prepping for her big date with Erica. Follow the jump for three more preview clips below!

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