Demetria Devonne "Demi" Lovato is an American singer, songwriter, actress and model. Musically, Lovato is considered a pop, pop rock, and R&B artist. Lovato is a full lyric soprano. She has a vocal range of four octaves and a semitone, including the whistle register. Lovato is also a skilled piano and guitar player. Her fans are known as Lovatics. She has stated that Joe Jonas is her best friend and the couple dated for a short while. Jonas called it off because he said their friendship was more important. We guess no one is immune to the friendzone.