It's finally here: the beginning of the big crossover event. But there's plenty going on in Seattle besides the much-anticipated overlap with Private Practice's Addison & Co.

In tonight's episode of Grey's Anatomy, "Beat Your Heart Out," McDreamy has the engagement ring - and everybody, we mean everybody at SGH - is going to see it.

With the exception of Meredith Grey, of course.

Elsewhere, Lexie demands that Mark go public with their relationship, while Bailey, encouraged by her work on recent cases and by Dr. Dixon, considers a new direction for her medical career. Cristina's relationship with Owen continues to progress, as well.

Check out the videos and gallery we've posted for previews!

As always, you can discuss "Beat Your Heart Out" before, during and after the show in our

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