Well, in an interview with ET Online, Director Susan Johnson revealed the story behind that pic, and I spontaneously COMBUSTED. Here's what she had to say:
"I can tell you. I don’t think this will blow any magic in telling you what happened with that. That was actually one of our crew members who took that photo. The two of them were in the green room on set at the high school location, in the area where we put the actors. They actually were sleeping on the couch in that room like that, so we just stood over them and took that picture and it’s so friggin’ cute. So yeah, we just borrowed it from our crew member. (Laughs.) There wasn’t [a scene]. I could make something up but I actually think it’s cute that they hang out like that."