Now that we know it's not Callie and Arizona tying the knot on Grey's Anatomy - by now you've surely heard about Cristina and Owen - what's in store for Calzona this year?

Let's just say it's shaping up to be a crowded situation.

What brings Amelia and Derek - and two ABC shows - together this fall?

Arizona decides to move in with Callie, according to EW, and of course, Torres is sharing an apartment with Cristina ... who's become the anti-Cristina and is marrying Owen.

That’s not the only obstacle, either. Creator Shonda Rhimes reveals that “Some stuff happens with their careers that’s going to take them in opposite directions possibly.”

Shifting gears, we've got some dish on the Grey’s Anatomy-Private Practice crossover involving Derek’s sister Amelia as well. What brings the two Shepherds together?

“Amelia goes to visit Derek in the third episode of Grey’s Anatomy," Rhimes reveals, adding that in the finale, "Derek got shot and he hasn’t been returning her phone calls."

"He’s never returned her phone calls. And what I love about this particular episode is that it really illuminates Derek Shepherd. Remember: Derek’s father was shot when they were kids - something that both Amelia and Derek witnessed."

"For both of them, Derek’s shooting brings up all these memories of that. You also get to see the two Shepherd neurosurgeons operating together, which I think is badass.”

We'd have to agree. Are you excited for the Private Practice crossover event, or tired of them at this point? What are your thoughts on Calzona? Share!

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