Worst: Demi Lovato's Summer Bummer
Nobody can out-Miley Miley. Where Cyrus' twerking in 2013 was campy and goofy, Demi Lovato's hyper-sexual performance of "Cool for the Summer" — in which she popped cherry balloons and murdered a metaphor — came off as crass and too self-aware. Dressed in fishnets and lingerie, the singer opened the performance flanked by backup dancers who looked like marshmallow Peeps and thrusted her crotch. And even though Iggy Azalea's cameo was a mumbly mess, the worst part of the performance came when Lovato climbed into an inflatable raft bound for the audience only to be carried by security guards who wouldn't let the fans near her. It looked like the saddest mosh pit ever.