The big crossover event (much as that label may be annoying) is almost upon us and we are as excited as you are. Below are three more sneak previews of tomorrow night's much-anticipated episode of Grey's Anatomy, entitled "Beat Your Heart Out."

Previously, we saw Derek try to act casual when nearly cornered by Meredith discussing his plans to propose. Now, he's getting advice not only from his fellow doctors on how to pop the question, but from one of his patients (guest star Jennifer Westfeldt) ...

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

Follow the jump for two more preview clips featuring Dr. Bailey and Dr. Arizona Robbins, as well as an encore presentation of the Private Practice sneak preview that prompts Addison's return to Seattle Grace, in case you missed that when we first posted it ...

[video url="http://www.tvfanatic.com/videos/beat-your-heart-out-sneak-peek-3/" title="Beat Your Heart Out Sneak Peek #3"][/video]

[video url="http://www.tvfanatic.com/videos/beat-your-heart-out-sneak-peek-4/" title="Beat Your Heart Out Sneak Peek #4"][/video]

[video url="http://www.tvfanatic.com/videos/greys-anatomy-private-practice-crossover-sneak-preview/" title="Grey's Anatomy-Private Practice Crossover Sneak Preview"] [/video]

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.