Fifth Harmony React To "Work From Home" Being Most Watched

The iHeartRadio Jingle Ball in New York City over the weekend, Friday December 9, featured an epic line-up including Justin Bieber, Ariana Grande, The Chainsmokers, DNCE, Meghan Trainor, Niall Horan and many more.

The show opened with a performance from hugely successful five-piece girl group Fifth Harmony, opening proceedings with their smash hit "That's My Girl."

The girls hung out with Elvis Duran from New York's Z100 backstage after their set where it was revealed to them that their music video for "Work From Home" was the most watched YouTube video of 2016! Their excited reaction is the cutest, but also a little bit weird... something about their boobs getting bigger?! Watch at top..

Listen to Fifth Harmony on iHeartRadio NOW! Click here.

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