Taylor Swift is known for her off-stage dancing as she is for her killer on-stage performances, and Sunday night's American Music Awards proved no exception. After opening the show with her " target="_hplink">first ever live-performance of "Blank Space," Swift cheered on her BFF Lorde as she performed "Yellow Flicker Beat," off "The Hunger Games" soundtrack. Swift, clad in a green dress, was spotted rocking out with another one of her good friend, supermodel Karlie Kloss. You be you, Tay.