I would say Miley Cyrus but ummm... I don't put her in the same league as the other popstars (or any of the Disney stars). She has potential to be a good country singer, but I can't stand her personality or the music she does. Or her voice, but again, it has a country twang to it. Pop + Her voice = Mess.
So my actual choice is Jessie J. She has a great voice, but overuses it. Her music is awful but I must admit I have grown to like Domino, even though it's safe & calculated trash. Laser Light is okay but also recycled. She wastes her huge potential.
Britney Spears because she does nothing for me like in the past. I liked her music back then but I hate Femme Fatale and right now I think she's just..... THERE...