She has mastered the innocent-but-fierce expression, and the little hair twirl is just icing on the cake.
.
The next time you watch The Big Bang Theory, think of this picture when you see Bernadette, and see if your viewing experience changes.
This is a very similar dress to the one she wore in The Big Bang Theory, in which she received a slow-motion walkout that showed Bernadette off in a completely new light.