Z100's Jingle Ball 2014 line-up doesn't disappoint. As John Basedow (@JohnBasedow) reports, Taylor Swift, Ariana Grande, Iggy Azalea, 5 Seconds of Summer, Pharrell, Sam Smith, Jessie J, Charli XCX, Maroon 5, Calvin Harris, OneRepublic, Meghan Trainor, Rita Ora, Shawn Mendes, Kiesza, Rixton and Nick Jonas will all be in attendance at the Madison Square Garden holiday event hosted by Elvis Duran hosts.