WATCH: Katy Perry Performs ‘Dark Horse’ at 2014 BRIT Awards [Video, Photos]Friends Read FreeSaveKaty Perry performs onstage at the BRIT Awards 2014 at the O2 Arena in London on Wednesday, Feb. 19, 2014. (Jon Furniss/Invision/AP)By Zachary Stieber2/19/2014Updated: 7/18/2015Print