When Grey's Anatomy and Private Practice return from their winter breaks January 14, Shonda Rhimes' shows will do so together in another two-part crossover extravaganza.

The focal point will be Mark's pregnant daughter, Sloane (we're still not over the name), and it looks like her condition has an impact on Mark and Lexie's relationship, too.

Here's a promo for "Blink" and "Another Second Chance" ...

[video url="http://www.tvfanatic.com/videos/2010-crossover-event-promo/" title="2010 Crossover Event Promo"] [/video]

Follow the jump for a second, longer preview of the two-hour crossover event that will bring the casts of Grey's Anatomy and Private Practice together once again ...

[video url="http://www.tvfanatic.com/videos/2010-crossover-event-promo-2/" title="2010 Crossover Event Promo #2"] [/video]

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