Miley Cyrus and Taylor Swift reportedly made fun of the Jonas Brothers at the Grammys. A source revealed to Star, that away from the public eye they're just like regular teenagers: 'Miley and Taylor spent most of the night ragging on the Jonas Brothers. These two are merciless when they get together. They were talking smack about Katy Perry's outfit and how boring Zac Efron and Vanessa Hudgens were. Demi Lovato and Selena Gomez also end up at the receiving end. Miley and Taylor seem sweet, but they can act like snotty little brats.'