Grey's Anatomy prepares to drop a McSteamy bombshell - Latest from Ausiello Posted by Simona at Saturday, November 07, 2009 View Comments Labels: Grey's Anatomy, Private Practice

WARNING: If you're a fan og Grey's Anatomy lovebirds Mark (Eric Dane) and Lexie (Chyler Leigh), grad a defibrillato before reading.
A Grey's/Private Practice crossover slated to air in January will find the doctor formerly known as McSteamy spending some quality time with his currently single ex Addison (Kate Walsh). "They've both really grown up since they were together, and most of the animosity that they had is gone," says Shonda Rhimes, executive producer of both shows. "Now they're friends, but they may end up falling back into their old patterns while they're together."
But wait, there's more (so keep those paddles handy). The reason Mark summons Addison to Seattle Grace -prompting him to visit her in L.A. in the second hour of the crossover- is that he needs her to perform a surgery on a woman from his past. Actually, make that a girl (played by Terminator: The Sarah Connor Chronicles alum Leven Rambin, who first appears on Nov. 19) -and a pregnant one at that! Rhimes declines to reveal the character's connection to Mark, but one of the rumors currently making the rounds is that the girl is his daughter.
"It's a new obstacle for Lexie and Mark," teases Rhimes of Rambin's role. "I'm not sure it's the kind of obstacle people are expecting, but it's definitely a new one. I'm not sure they'll stick together through it."
Okay, you can go ahead and use those paddles now.

Source: EW