Music mogul LA Reid has revealed what surprises him the most about girl group Fifth Harmony. 

Speaking to Billboard about the successful band, he admitted that their dynamic and closeness is amazing and he genuinely didn't expect them to get along so well:

"The sisterhood. The closeness is surprising. Because by design it shouldn't work, but it does. That's surprising. I was in a band once. We all went to high school together."

"But they met each other at the X Factor auditions, and then they found out in front of a live audience that they were going to be a band one day, and now you're challenged to make it work, enjoy it, be creative, be competitive, and keep a good sense of humour about it! That's a lot to ask. What am I surprised about? That they haven't quacked up! [laughs] They should be nuts by now. I would be."

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Watch the girls' new music video below: