Rita Ora onstage during HOT 99.5’s Jingle Ball 2014 at VERIZON CENTER on December 15, 2014 in Washington, DC. (Photo: Andrew Swartz for iHeartRadio)

Rita Ora onstage during HOT 99.5’s Jingle Ball 2014 at VERIZON CENTER on December 15, 2014 in Washington, DC. (Photo: Andrew Swartz for iHeartRadio)

Gwen Stefani and Pharrell onstage during iHeartRadio Jingle Ball 2014, hosted by Z100 New York at Madison Square Garden on December 12, 2014 in New York City. (Photo: Andrew Swartz for iHeartRadio)

Gwen Stefani and Pharrell onstage during iHeartRadio Jingle Ball 2014, hosted by Z100 New York at Madison Square Garden on December 12, 2014 in New York City. (Photo: Andrew Swartz for iHeartRadio)

Pharrell onstage at iHeartRadio Jingle Ball 2014, hosted by Y100MIAMI at BB&T Center on December 21, 2014. (Photo: Andrew Swartz for iHeartRadio)

Pharrell onstage at iHeartRadio Jingle Ball 2014, hosted by Y100MIAMI at BB&T Center on December 21, 2014. (Photo: Andrew Swartz for iHeartRadio)

Jessie J onstage during 93.3 FLZ's Jingle Ball 2014 at the Amalie Arena on December 22, 2014 in Tampa, FL. (Photo: Brian Friedman for iHeartRadio)

Jessie J onstage during 93.3 FLZ's Jingle Ball 2014 at the Amalie Arena on December 22, 2014 in Tampa, FL. (Photo: Brian Friedman for iHeartRadio)

Pharrell onstage during iHeartRadio Jingle Ball 2014, hosted by Z100 New York at Madison Square Garden on December 12, 2014 in New York City. (Photo: Andrew Swartz for iHeartRadio)

Pharrell onstage during iHeartRadio Jingle Ball 2014, hosted by Z100 New York at Madison Square Garden on December 12, 2014 in New York City. (Photo: Andrew Swartz for iHeartRadio)

Meghan Trainor onstage during Kiss 108’s Jingle Ball 2014 at TD GARDEN on December 14, 2014 in Boston, MA. (Photo: Jordan Corey for iHeartRadio)

Meghan Trainor onstage during Kiss 108’s Jingle Ball 2014 at TD GARDEN on December 14, 2014 in Boston, MA. (Photo: Jordan Corey for iHeartRadio)

Meghan Trainor onstage during 103.5 KISS FM’s Jingle Ball 2014 at Allstate Arena on December 18, 2014 in Chicago, IL. (Photo: Getty Images for iHeartRadio)

Meghan Trainor onstage during 103.5 KISS FM’s Jingle Ball 2014 at Allstate Arena on December 18, 2014 in Chicago, IL. (Photo: Getty Images for iHeartRadio)

Charli XCX onstage during HOT 99.5’s Jingle Ball 2014 at Verizon Center on December 15, 2014 in Washington, DC. (Photo: Brian Friedman for iHeartRadio)

Charli XCX onstage during HOT 99.5’s Jingle Ball 2014 at Verizon Center on December 15, 2014 in Washington, DC. (Photo: Brian Friedman for iHeartRadio)

Ariana Grande onstage during HOT 99.5’s Jingle Ball 2014 at VERIZON CENTER on December 15, 2014 in Washington, DC. (Photo: Getty Images for iHeartRadio)

Ariana Grande onstage during HOT 99.5’s Jingle Ball 2014 at VERIZON CENTER on December 15, 2014 in Washington, DC. (Photo: Getty Images for iHeartRadio)

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