With the mega-crossover event just a day away, more sneak previews of tomorrow night's Grey's Anatomy have been released. In the new clip below, Derek - who already told Mark - shares his plan to propose to Meredith with one of his patients (guest star Jennifer Westfeldt)...

[video url="http://www.greysanatomyinsider.com/videos/beat-your-heart-out-sneak-peek-2/" title="Beat Your Heart Out Sneak Peek #2"][/video]

What happens with Dr. Bailey and Dr. Arizona Robbins? How will Addison make her way back to Seattle? Follow the link for more Grey's Anatomy videos from "Beat Your Heart Out" ...

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