KIIS FM’s Jingle Ball in Los Angeles (15 Photos)

Taylor Swift, Pharrell, Ariana Grande, Iggy Azalea, Jessie J, Sam Smith and 5 Seconds of Summer headline KIIS FM’s Jingle Ball.

Singers Grande and J perform during KIIS FM's Jingle Ball 2014 at Staples Center in Los Angeles

Singers Ariana Grande and Jessie J perform during KIIS FM’s Jingle Ball 2014 at Staples Center in Los Angeles, California December 5, 2014.

Photographer: Mario Anzuon
Recording artists Gwen Stefani and Pharrell Williams perform during KIIS FM's Jingle Ball 2014 at Staples Center in Los Angeles
Gwen Stefani and Pharrell Williams perform during KIIS FM’s Jingle Ball 2014 at Staples Center in Los Angeles, California December 5, 2014.
Recording artists Azalea and Ora perform during KIIS FM's Jingle Ball 2014 at Staples Center in Los Angeles Iggy Azalea and Rita Ora perform during KIIS FM’s Jingle Ball 2014 at Staples Center in Los Angeles, California December 5, 2014.
Recording artist Taylor Swift performs during KIIS FM's Jingle Ball 2014 at Staples Center in Los Angeles
Singers Grande and Big Sean perform during KIIS FM's Jingle Ball 2014 at Staples Center in Los Angeles Singers Lovato performs during KIIS FM's Jingle Ball 2014 at Staples Center in Los Angeles, California Recording artist Ed Sheeran performs during KIIS FM's Jingle Ball 2014 at Staples Center in Los Angeles Recording artist Gwen Stefani performs with Pharrell Williams during KIIS FM's Jingle Ball 2014 at Staples Center in Los Angeles Recording artists Azalea and Charli XCX perform during KIIS FM's Jingle Ball 2014 at Staples Center in Los Angeles Singer Jessie J performs during KIIS FM's Jingle Ball 2014 at Staples Center in Los Angeles Guitarists and vocalistd Hemmings and Clifford of 5 Seconds of Summer perform during KIIS FM's Jingle Ball 2014 at Staples Center in Los Angeles Recording artist Pharrell Williams performs during KIIS FM's Jingle Ball 2014 at Staples Center in Los Angeles Singer Rita Ora performs during KIIS FM's Jingle Ball 2014 at Staples Center in Los Angeles Recording artist Smith performs during KIIS FM's Jingle Ball 2014 at Staples Center in Los Angeles Recording artist Taylor Swift performs during KIIS FM's Jingle Ball 2014 at Staples Center in Los Angeles
Taylor Swift performs during KIIS FM’s Jingle Ball 2014 at Staples Center in Los Angeles, California.  Photographer: Mario Anzuoni/Reuters