Girl group Fifth Harmony are due to head over to the UK in December for a performance on 'The X Factor' and they have opened up about their impressive rise to fame in a new interview with EntertainmentWise. 

Member Ally Brooke Hernandez explained that going from taking part in 'X Factor USA' back in 2012 to being guest performers on the British edition of the show two years later is incredible:

"Crazy. I’m 21 now but when we started out I was 18. It was kind of thing where once you went, you went. It was zero to a hundred real quick! It was pretty intense. I think it really helps that throughout all of them, throughout the pressures and the high and low of the competition, we all had each-other."

The star went onto add that being able to go through this experience with her bandmates has made it more enjoyable: We all had each-other to lean on so that was so nice to have that. We still have that today and we’re just stronger as a group and as people so it’s really, really awesome."

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Watch a teaser for the girls' music video for 'Sledgehammer' below: