I'm going to give her a five and here's why: she doesn't give a ****. Her idea of beauty is what SHE wants it to be. She doesn't allow the people around her to say, "Look this way so you can look pretty."
When she wants to look pretty, she can.
When she wants to look like a dungeon troll, she can.
She is the only mainstream top 40 artist that can play with the way they look so effortlessly, and she's the only one that has the balls to do so. There's nothing more beautiful than someone who is completely confident with who they are and what they look like.
Oh, and not to mention her heart (see my signature).