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Next week is the big Grey's Anatomy-Private Practice crossover, and when Caterina Scorsone told us that her character Amelia Shepherd had some "bad behavior," she wasn't kidding. We'll learn from Derek (Patrick Dempsey) that she was a serious drug addict for a long time. Whoa!

Click in to see for yourself, plus see how Cristina (Sandra Oh) is recovering from her trauma (she's not) and learn a shocking secret about April (Sarah Drew):

Juicy, yes? What do you think of these clips? Tell us in the comments!

PHOTOS: Fashion Spotlight: Grey's Gals