Elvis and AMO break character

Just noticed this in the champagne cork scene: after Elvis sprays Danova, some of the champagne spray gets on AMO. She breaks out in a big smile, he continues fumbling with the bottle, she looks over smiling at him and makes the typical female 'I can't believe this guy' sound which causes Elvis to break up during his lines. Clearly, to me, it's not Lucky and Rusty interacting, but Elvis and Ann-Margret. Great scene, in fact, the entire 'Elvis as waiter' sequence is fantastic.