What Is This?!?!?

Ok, so I was taking photos of Londyn last night, and Skylar was apparently a little jealous. She came out and wanted me to take a few of her. She loves to pose, which is pretty cute most of the time. However, I'm not sure I'm ready for this new open mouth sassy look. Seriously, what is this? Is this what I have to look forward to in years to come? I like the sweet and innocent little girl looks, hopefully this was just a momentary lapse in judgement.