I was going through her instagram (http://instagram.com/arianagrande) and she's definitely gotten thinner. Her new song "Problem" came out...I personally can't stand her voice. It's so nasally, and I can't ever understand what she's saying.
I read somewhere that she MAY have had an eating disorder cause she constantly wears a red ana bracelet but I'm not sure if it's true.
I agree 100% about her nasally voice. When I heard problems I had no idea what she was saying, it was like listening to someone with the flu singing.