Scoop: Is Grey's Throwing a Double Wedding?

[The following contains some spoilers from last night’s episode of Grey’s Anatomy.]

It turns out that rumors of a Callie-Arizona wedding on Grey’s Anatomy have not been greatly exaggerated.

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With Callie’s life-and-death crisis — as well as the fate of her prematurely birthed baby — happily resolved in Thursday’s musical episode, TVLine can confirm that the star-crossed lesbian lovers will walk down the aisle in the episode airing May 5.

The duo’s big day, however, will not be without its drama. And two conspicuous absences at the ceremony can’t help but make us wonder if a second couple is off sealing their own deal. (But more on that in a bit.)

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Teasing one guaranteed wedding-day twist, Jessica Capshaw (Arizona) tells us, “There is a circumstance that leaves Callie’s father (played by Hector Elizondo) to not be able to walk her down the aisle.”

Of course, Carlos Torres was not the No. 1 fan of his daughter’s same-sex romance to begin with, though he eventually came around. Mostly. But getting Dad’s half-hearted sign-off may have only been half the battle for Callie.

“What’s really beautiful about this episode,” says Sara Ramirez, “is that there is a moment where Callie is really kind of doubting herself and her life and the choices that she’s made. To pick this person to be with for the rest of her life is not received well by her mother (Santa Barbara‘s Gina Gallego), and that presents a real difficulty for her because I think she looks to her mother for some kind of emotional embracing around this whole event.”

Alas, Lucia Torres has her own thoughts on her little girl’s conundrum, so when it comes time for Callie to walk down the aisle, the guest list will have been altered significantly. But buoyed by a terrific pep talk from the ceremony’s extra-special officiant, Bailey (played by Chandra Wilson, who also directed the episode), Callie finds the inner strength she needs to forge ahead — and with a McSteamy man on her arm.

“Mark ends up giving her away, which is really sweet,” Ramirez reveals. “He has always been Callie’s best friend, through thick and thin … and now they have a child together. They’re bonded for life, basically!”

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Now, back to that rather curious guest list. When TVLine visited the Grey’s set to observe the wedding shoot, the entire cast was on hand… save for Ellen Pompeo and Patrick Dempsey. As such, we had to muse: Could Mer and Der be off partaking in their own nuptials? Or better yet, might they be waiting in the wings to be wed by Bailey following Calzona’s own vows? (After all, rumors have been circulating that Drs. Grey and Shepherd will make their Post-It union official this season.)

“That’s an interesting idea, I never thought of that,” responded one wedding guest — Kevin McKidd — when we offered up that theory. Owen’s portrayer then added with a grin, “I can’t tell you anything about that.”

What’s your theory, Grey’s fans? Do you think the show might double up on I Do’s in that May episode? (With reporting by Vlada Gelman)