I was going through a bunch of photographs the other night, having finally stumbled upon the red-eye-erasing tool, and was stunned to notice the drastic change in Gwen's appearance from only a month ago. Her teeth have made a huge difference!
August 3rd - four teeth September 6th - 10 teeth
Incidentally, in that second picture she is dancing in her booster seat, thus the head tilt. Goin' for the Axl Rose moves, I guess?