Our favorite show's 99th installment last night was terrific. Below is a sneak preview for next week's landmark 100th episode of Grey's Anatomy, "What a Difference a Day Makes."

It's the day of Meredith and Derek's wedding and the bride-to-be is feeling a bit nervous about what's to come. Her maid of honor isn't exactly helping calm her nerves ...

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Follow the jump for the 30-second promo that aired after last night's show, as well as another sneak preview of the episode featuring the wedding-obsessed Izzie Stevens.

After begging Bailey to let her attend the big event in spite of her deteriorating condition, Izzie starts to experience some familiar symptoms. Handsomely familiar ...

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