Fifth Harmony have reflected on the huge success of their single 'Worth It'.

The girl group unleashed the track earlier this year as one of the lead songs from their debut album 'Reflection'.

The tune peaked at No.12 in the US and managed to reach No.3 in the UK.

Speaking to ABC Radio, singer Ally Brooke Hernandez admitted that the girls weren't expecting that level of success.

He said: "Oh my gosh, that was so crazy ‘cause, you know, it’s been a lot just going from X Factor to here, figuring out who we are as artists and as a group.

"And to see 'Worth It' do so well, and all of our...struggle[s] paying off like that was crazy!"

"We were just like, honestly, 'We just can’t believe it!' I still can’t believe it to this day! I’m like, 'What?! What?!'."

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Watch Fifth Harmony's 'Worth It' video below: