Macy`s iHeartRadio Rising Star Christina Grimmie performs during the 2015 iHeartRadio Music Festival at the MGM Grand Garden Arena in Las Vegas, Nevada September 18, 2015. Photo: Reuters
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Macy`s iHeartRadio Rising Star Christina Grimmie performs with dancers during the 2015 iHeartRadio Music Festival at the MGM Grand Garden Arena in Las Vegas, Nevada September 18, 2015. Photo: Reuters
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British singer Sam Smith (C) performs with Disclosure, a British electronic music duo of brothers Howard and Guy Lawrence, during the 2015 iHeartRadio Music Festival at the MGM Grand Garden Arena in Las Vegas, Nevada September 18, 2015. Photo: Reuters
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Confetti falls on the audience during the 2015 iHeartRadio Music Festival at the MGM Grand Garden Arena in Las Vegas, Nevada September 18, 2015.Photo: Reuters
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Fall Out Boy vocalist and guitarist Patrick Stump performs during the second night of the 2015 iHeartRadio Music Festival at the MGM Grand Garden Arena in Las Vegas, Nevada September 19, 2015. Photo: Reuters
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Busta Rhymes (R) performs with Puff Daddy during the second night of the 2015 iHeartRadio Music Festival at the MGM Grand Garden Arena in Las Vegas, Nevada September 19, 2015. Photo: Reuters
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Puff Daddy (L) performs with Tori Kelly during the second night of the 2015 iHeartRadio Music Festival at the MGM Grand Garden Arena in Las Vegas, Nevada September 19, 2015. Photo: Reuters
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Hozier performs during the second night of the 2015 iHeartRadio Music Festival at the MGM Grand Garden Arena in Las Vegas, Nevada September 19, 2015. Photo: Reuters
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Blake Shelton performs during the second night of the 2015 iHeartRadio Music Festival at the MGM Grand Garden Arena in Las Vegas, Nevada September 19, 2015. Photo: Reuters
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Hailee Steinfeld performs during the 2015 iHeartRadio Daytime Village in Las Vegas, Nevada September 19, 2015. Photo: Reuters
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Fans react to a performance during the 2015 iHeartRadio Daytime Village in Las Vegas, Nevada September 19, 2015. Photo: Reuters
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Nick Jonas performs during the 2015 iHeartRadio Daytime Village in Las Vegas, Nevada September 19, 2015. Photo: Reuters
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James Bay performs during the 2015 iHeartRadio Daytime Village in Las Vegas, Nevada September 19, 2015. Photo: Reuters
