Emily follows her out and lays a hand on her shoulder as she asks if she can do anything. Cristina whips around like her touch was fire, and blurts out angrily, "Can you stop screwing my husband?" It's not yelling at your wife that she killed your baby while you are at a one-year-old's birthday party, but still pretty high up on the list of awkward outbursts.
It seems like Cristina realized this and also was as surprised as Emily that she said it; she tries to leave, mumbling that she had no idea why she said that, but Emily runs after her and unfortunately tries to touch her arm again. It at least gets Cristina turned around so she can yell at her again. Emily admits that she's a total flirt but promises that nothing happened and even offers for Cristina to go through her phone and call her boyfriend -- she's got one, and she switched to nights because of his schedule -- to prove it. She apologizes profusely and swears she would never, ever do that; Cristina doesn't apologize but she does leave so that Emily doesn't have to keep trying to assure her.
Mere walks by a room where she sees Derek reading Lexie the riot act, and Lexie looks awful but is keeping all of her tears fully in check as Mere advised.
Jackson, in a tux, escorts Mara, in a slinky gold gown, down the stairs to meet his mom -- they are a couple of scorchingly hot people, right there. Once they are downstairs, though, Jackson announces that Mara has something to say and he holds on to her to give her support as she shakily takes a stand and tells Catherine they aren't going to go with her. Catherine is all, "O RLY?"(tm Joe R) and Mara immediately tries to back down but Jackson makes her hold firm, and she tells Catherine that since she was brought to Seattle on a personal errand, she thinks she can take the night off. Jackson is all proud and Mara feels good enough to try and continue with some more opinions but Catherine icily tells her to stop and Jackson whispers that yes, she's done now. He was right that his mom would have some sort of respect because instead of smacking them down she teases them that he captured her spy; Jackson promises that she'll be treated well and then kisses his mom goodbye. She calls after him that she was going to uninvite them anyway, since she has a date.
Morgan is talking to Tommy, who is chilling in his incubator, when Callie conveniently walks in to find Arizona just as Morgan wants someone to take a photo. Callie is more than happy to help, and is even happier to be proven right as Morgan tries to get Alex in to the photo. Now that he can really see what's up, he tries to decline, but she makes him come over anyway. He's got a bit of a weirded-out smile in the photo, while Callie looks at him with a shit-eating grin and whispers to him that she is a "smitten kitten." Alex looks a little sick at the thought, now that he can't deny it, while Morgan just gazes at him adoringly.