Grey's Anatomy Season 9, Episode 9: “Run, Baby, Run" (December 13) is the last episode before the winter hiatus, and Shonda Rhimes promises it's going to be great.

For those who can't wait to find out what happens, we've gathered all the juiciest spoilers about the episode right here.

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Wedding jitters: It's time for Bailey's (Chandra Wilson) wedding to Ben, but as this sneak peek shows, she's not exactly a big bucket of excitement, and according to the press release about the episode she'll need Richard (James Pickens Jr.) to help her cope with the jitters. According to Chandra Wilson, the wedding is basically a "surprise" to Bailey — but we do know she winds up in a wedding dress, and we're pretty confident that she will end up walking down the aisle.

Calzona problems: In this sneak peek, we see that Callie (Sara Ramirez) is still feeling the stress of living with a very depressed Arizona (Jessica Capshaw). However, it sounds like this couple will have a memorable breakthrough when Callie brings Arizona's pity party to an end.

Liz's anger: According to the press release, Meredith (Ellen Pompeo) and Derek's (Patrick Dempsey) sister Liz (Never Campbell) will "butt heads," and in this sneak peek we learn that Liz is pissed that Mer and Der never invited her to come meet Zola.

Meredith's worry: We know that Mer feels trepidation about her risky pregnancy, and based on this sneak peek, that will be addressed in this episode.

Derek's hand? The official press release for the episode notes that we'll also see Callie and Jackson (Jesse Williams) attempt to convince Derek to go through with a "risky surgery" for his hand.

Owen and Cristina's turning point: In this sneak peek we learn that Owen (Kevin McKidd) and Cristina's (Sandra Oh) divorce papers are ready. According to TVLine this will force them to reach a "turning point" in their relationship. Does that mean they sign the papers — or could it be that they decide not to get divorced after all?

Avoiding the wedding: TVLine also reports that "April [Sarah Drew] and Jackson go to great (read: hilarious) lengths to avoid attending Bailey’s nuptials together." Oh dear.

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Catch the next new episode of Grey’s Anatomy on Thursday, December 13 at 9 p.m. ET/PT on ABC.

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