KIIS FM's Jingle Ball 2014 Powered by LINE - Backstage

(L-R) Singers Gwen Stefani, Pharrell Williams and Charli XCX attend KIIS FM's Jingle Ball 2014 powered by LINE at Staples Center on December 5, 2014 in Los Angeles, California.
(Dec. 4, 2014 - Source: Christopher Polk/Getty Images North America)