THE CONCERT EVENT OF THE HOLIDAY SEASON -- Hosted by Elvis Duran of iHeartMedia's Z100, New York's Hit Music Station, the concert was filmed at New York City's famed Madison Square Garden. The lineup of musical acts scheduled to perform include Justin Bieber, Ariana Grande, Diplo, The Chainsmokers, Fifth Harmony, Charlie Puth, Lukas Graham, DNCE, and many more including a special guest appearance by Niall Horan. Original airdate 12/15/2016.

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NEW YORK, NY - DECEMBER 09: The Chainsmokers perform onstage during Z100's Jingle Ball 2016 at Madison Square Garden on December 9, 2016 in New York, New York. (Photo by Todd Owyoung for iHeartRadio)

THE CONCERT EVENT OF THE HOLIDAY SEASON -- Hosted by Elvis Duran of iHeartMedia's Z100, New York's Hit Music Station, the concert was filmed at New York City's famed Madison Square Garden. The lineup of musical acts scheduled to perform include Justin Bieber, Ariana Grande, Diplo, The Chainsmokers, Fifth Harmony, Charlie Puth, Lukas Graham, DNCE, and many more including a special guest appearance by Niall Horan. Original airdate 12/15/2016.

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NEW YORK, NY - DECEMBER 09: Fifth Harmony performs onstage during Z100's Jingle Ball 2016 at Madison Square Garden on December 9, 2016 in New York, New York. (Photo by Todd Owyoung for iHeartRadio)

THE CONCERT EVENT OF THE HOLIDAY SEASON -- Hosted by Elvis Duran of iHeartMedia's Z100, New York's Hit Music Station, the concert was filmed at New York City's famed Madison Square Garden. The lineup of musical acts scheduled to perform include Justin Bieber, Ariana Grande, Diplo, The Chainsmokers, Fifth Harmony, Charlie Puth, Lukas Graham, DNCE, and many more including a special guest appearance by Niall Horan. Original airdate 12/15/2016.

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NEW YORK, NY - DECEMBER 09: Recording artist Ariana Grande performs onstage during Z100's Jingle Ball 2016 at Madison Square Garden on December 9, 2016 in New York, New York. (Photo by Todd Owyoung for iHeartRadio)

THE CONCERT EVENT OF THE HOLIDAY SEASON -- Hosted by Elvis Duran of iHeartMedia's Z100, New York's Hit Music Station, the concert was filmed at New York City's famed Madison Square Garden. The lineup of musical acts scheduled to perform include Justin Bieber, Ariana Grande, Diplo, The Chainsmokers, Fifth Harmony, Charlie Puth, Lukas Graham, DNCE, and many more including a special guest appearance by Niall Horan. Original airdate 12/15/2016.

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NEW YORK, NY - DECEMBER 09: Charlie Puth performs onstage during Z100's Jingle Ball 2016 at Madison Square Garden on December 9, 2016 in New York, New York. (Photo by Todd Owyoung for iHeartRadio)

THE CONCERT EVENT OF THE HOLIDAY SEASON -- Hosted by Elvis Duran of iHeartMedia's Z100, New York's Hit Music Station, the concert was filmed at New York City's famed Madison Square Garden. The lineup of musical acts scheduled to perform include Justin Bieber, Ariana Grande, Diplo, The Chainsmokers, Fifth Harmony, Charlie Puth, Lukas Graham, DNCE, and many more including a special guest appearance by Niall Horan. Original airdate 12/15/2016.

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NEW YORK, NY - DECEMBER 09: Hailee Steinfeld performs onstage during Z100's Jingle Ball 2016 at Madison Square Garden on December 9, 2016 in New York, New York. (Photo by Todd Owyoung for iHeartRadio)

THE CONCERT EVENT OF THE HOLIDAY SEASON -- Hosted by Elvis Duran of iHeartMedia's Z100, New York's Hit Music Station, the concert was filmed at New York City's famed Madison Square Garden. The lineup of musical acts scheduled to perform include Justin Bieber, Ariana Grande, Diplo, The Chainsmokers, Fifth Harmony, Charlie Puth, Lukas Graham, DNCE, and many more including a special guest appearance by Niall Horan. Original airdate 12/15/2016.

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NEW YORK, NY - DECEMBER 09: Niall Horan performs onstage during Z100's Jingle Ball 2016 at Madison Square Garden on December 9, 2016 in New York, New York. (Photo by Todd Owyoung for iHeartRadio)

THE CONCERT EVENT OF THE HOLIDAY SEASON -- Hosted by Elvis Duran of iHeartMedia's Z100, New York's Hit Music Station, the concert was filmed at New York City's famed Madison Square Garden. The lineup of musical acts scheduled to perform include Justin Bieber, Ariana Grande, Diplo, The Chainsmokers, Fifth Harmony, Charlie Puth, Lukas Graham, DNCE, and many more including a special guest appearance by Niall Horan. Original airdate 12/15/2016.

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NEW YORK, NY - DECEMBER 09: Recording artist Daya performs onstage during Z100's Jingle Ball 2016 at Madison Square Garden on December 9, 2016 in New York, New York. (Photo by Todd Owyoung for iHeartRadio)

THE CONCERT EVENT OF THE HOLIDAY SEASON -- Hosted by Elvis Duran of iHeartMedia's Z100, New York's Hit Music Station, the concert was filmed at New York City's famed Madison Square Garden. The lineup of musical acts scheduled to perform include Justin Bieber, Ariana Grande, Diplo, The Chainsmokers, Fifth Harmony, Charlie Puth, Lukas Graham, DNCE, and many more including a special guest appearance by Niall Horan. Original airdate 12/15/2016.

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NEW YORK, NY - DECEMBER 09: Diplo performs onstage during Z100's Jingle Ball 2016 at Madison Square Garden on December 9, 2016 in New York, New York. (Photo by Todd Owyoung for iHeartRadio)

THE CONCERT EVENT OF THE HOLIDAY SEASON -- Hosted by Elvis Duran of iHeartMedia's Z100, New York's Hit Music Station, the concert was filmed at New York City's famed Madison Square Garden. The lineup of musical acts scheduled to perform include Justin Bieber, Ariana Grande, Diplo, The Chainsmokers, Fifth Harmony, Charlie Puth, Lukas Graham, DNCE, and many more including a special guest appearance by Niall Horan. Original airdate 12/15/2016.

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NEW YORK, NY - DECEMBER 09: Recording artist Daya performs onstage during Z100's Jingle Ball 2016 at Madison Square Garden on December 9, 2016 in New York, New York. (Photo by Chris Owyoung for iHeartRadio)

THE CONCERT EVENT OF THE HOLIDAY SEASON -- Hosted by Elvis Duran of iHeartMedia's Z100, New York's Hit Music Station, the concert was filmed at New York City's famed Madison Square Garden. The lineup of musical acts scheduled to perform include Justin Bieber, Ariana Grande, Diplo, The Chainsmokers, Fifth Harmony, Charlie Puth, Lukas Graham, DNCE, and many more including a special guest appearance by Niall Horan. Original airdate 12/15/2016.

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NEW YORK, NY - DECEMBER 09: Recording artist Ellie Goulding performs onstage during Z100's Jingle Ball 2016 at Madison Square Garden on December 9, 2016 in New York, New York. (Photo by Chris Owyoung for iHeartRadio)

THE CONCERT EVENT OF THE HOLIDAY SEASON -- Hosted by Elvis Duran of iHeartMedia's Z100, New York's Hit Music Station, the concert was filmed at New York City's famed Madison Square Garden. The lineup of musical acts scheduled to perform include Justin Bieber, Ariana Grande, Diplo, The Chainsmokers, Fifth Harmony, Charlie Puth, Lukas Graham, DNCE, and many more including a special guest appearance by Niall Horan. Original airdate 12/15/2016.

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NEW YORK, NY - DECEMBER 09: Musician Lukas Graham Forchhammer of Lukas Graham performs onstage during Z100's Jingle Ball 2016 at Madison Square Garden on December 9, 2016 in New York, New York. (Photo by Chris Owyoung for iHeartRadio)

THE CONCERT EVENT OF THE HOLIDAY SEASON -- Hosted by Elvis Duran of iHeartMedia's Z100, New York's Hit Music Station, the concert was filmed at New York City's famed Madison Square Garden. The lineup of musical acts scheduled to perform include Justin Bieber, Ariana Grande, Diplo, The Chainsmokers, Fifth Harmony, Charlie Puth, Lukas Graham, DNCE, and many more including a special guest appearance by Niall Horan. Original airdate 12/15/2016.

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NEW YORK, NY - DECEMBER 09: Musician Justin Bieber performs onstage during Z100's Jingle Ball 2016 at Madison Square Garden on December 9, 2016 in New York, New York. (Photo by Chris Owyoung for iHeartRadio)

THE CONCERT EVENT OF THE HOLIDAY SEASON -- Hosted by Elvis Duran of iHeartMedia's Z100, New York's Hit Music Station, the concert was filmed at New York City's famed Madison Square Garden. The lineup of musical acts scheduled to perform include Justin Bieber, Ariana Grande, Diplo, The Chainsmokers, Fifth Harmony, Charlie Puth, Lukas Graham, DNCE, and many more including a special guest appearance by Niall Horan. Original airdate 12/15/2016.

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NEW YORK, NY - DECEMBER 09: Fifth Harmony performs onstage during Z100's Jingle Ball 2016 at Madison Square Garden on December 9, 2016 in New York, New York. (Photo by Brian Friedman for iHeartRadio)

NIGHT TWO OF A TWO PART LAS VEGAS CONCERT EVENT -- The legendary concert event, filmed over two nights at Las Vegas' T-Mobile Arena, features performances by some of the biggest names in the music industry. Hosted by Ryan Seacrest ("On Air with Ryan Seacrest"), the iconic lineup of musical acts scheduled to perform include Usher, Sting, Britney Spears, Ariana Grande, Florida Georgia Line, and many more. Original airdate 10/7/2016.

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LAS VEGAS, NV - SEPTEMBER 23: Recording artist Sia performs onstage at the 2016 iHeartRadio Music Festival at T-Mobile Arena on September 23, 2016 in Las Vegas, Nevada. (Photo by Chris Owyoung for iHeartRadio)

NIGHT TWO OF A TWO PART LAS VEGAS CONCERT EVENT -- The legendary concert event, filmed over two nights at Las Vegas' T-Mobile Arena, features performances by some of the biggest names in the music industry. Hosted by Ryan Seacrest ("On Air with Ryan Seacrest"), the iconic lineup of musical acts scheduled to perform include Usher, Sting, Britney Spears, Ariana Grande, Florida Georgia Line, and many more. Original airdate 10/7/2016.

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LAS VEGAS, NV - SEPTEMBER 23: Recording artist Sia performs onstage at the 2016 iHeartRadio Music Festival at T-Mobile Arena on September 23, 2016 in Las Vegas, Nevada. (Photo by Brian Friedman for iHeartRadio)

NIGHT TWO OF A TWO PART LAS VEGAS CONCERT EVENT -- The legendary concert event, filmed over two nights at Las Vegas' T-Mobile Arena, features performances by some of the biggest names in the music industry. Hosted by Ryan Seacrest ("On Air with Ryan Seacrest"), the iconic lineup of musical acts scheduled to perform include Usher, Sting, Britney Spears, Ariana Grande, Florida Georgia Line, and many more. Original airdate 10/7/2016.

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LAS VEGAS, NV - SEPTEMBER 24: Recording artist Sting performs onstage at the 2016 iHeartRadio Music Festival at T-Mobile Arena on September 24, 2016 in Las Vegas, Nevada. (Photo by Todd Owyoung for iHeartRadio)

NIGHT TWO OF A TWO PART LAS VEGAS CONCERT EVENT -- The legendary concert event, filmed over two nights at Las Vegas' T-Mobile Arena, features performances by some of the biggest names in the music industry. Hosted by Ryan Seacrest ("On Air with Ryan Seacrest"), the iconic lineup of musical acts scheduled to perform include Usher, Sting, Britney Spears, Ariana Grande, Florida Georgia Line, and many more. Original airdate 10/7/2016.

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LAS VEGAS, NV - SEPTEMBER 24: Recording artist Ariana Grande performs onstage at the 2016 iHeartRadio Music Festival at T-Mobile Arena on September 24, 2016 in Las Vegas, Nevada. (Photo by Todd Owyoung for iHeartRadio)

NIGHT TWO OF A TWO PART LAS VEGAS CONCERT EVENT -- The legendary concert event, filmed over two nights at Las Vegas' T-Mobile Arena, features performances by some of the biggest names in the music industry. Hosted by Ryan Seacrest ("On Air with Ryan Seacrest"), the iconic lineup of musical acts scheduled to perform include Usher, Sting, Britney Spears, Ariana Grande, Florida Georgia Line, and many more. Original airdate 10/7/2016.

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LAS VEGAS, NV - SEPTEMBER 24: Recording artists Backstreet Boys and Florida Georgia Line perform onstage at the 2016 iHeartRadio Music Festival at T-Mobile Arena on September 24, 2016 in Las Vegas, Nevada. (Photo by Todd Owyoung for iHeartRadio)

NIGHT TWO OF A TWO PART LAS VEGAS CONCERT EVENT -- The legendary concert event, filmed over two nights at Las Vegas' T-Mobile Arena, features performances by some of the biggest names in the music industry. Hosted by Ryan Seacrest ("On Air with Ryan Seacrest"), the iconic lineup of musical acts scheduled to perform include Usher, Sting, Britney Spears, Ariana Grande, Florida Georgia Line, and many more. Original airdate 10/7/2016.

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LAS VEGAS, NV - SEPTEMBER 24: Recording artist Britney Spears performs onstage at the 2016 iHeartRadio Music Festival at T-Mobile Arena on September 24, 2016 in Las Vegas, Nevada. (Photo by Todd Owyoung for iHeartRadio)

NIGHT TWO OF A TWO PART LAS VEGAS CONCERT EVENT -- The legendary concert event, filmed over two nights at Las Vegas' T-Mobile Arena, features performances by some of the biggest names in the music industry. Hosted by Ryan Seacrest ("On Air with Ryan Seacrest"), the iconic lineup of musical acts scheduled to perform include Usher, Sting, Britney Spears, Ariana Grande, Florida Georgia Line, and many more. Original airdate 10/7/2016.

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LAS VEGAS, NV - SEPTEMBER 24: Recording artist Sting performs onstage at the 2016 iHeartRadio Music Festival at T-Mobile Arena on September 24, 2016 in Las Vegas, Nevada. (Photo by Todd Owyoung for iHeartRadio)