Little Mix have revealed that they are finding it difficult to make progress on their next album.

The group unleashed their second record 'Salute' in 2013 and it has proved hugely popular.

Work on its follow-up is already underway, but Jesy Nelson told Digital Spy that some aspects of the album aren't coming quite so easy.

"Well, I never thought we'd say it but we're actually finding this one quite hard. We know what we wanna do but we're in the early stages of it so it's still coming together. [It will be] kind of similar to [Salute], but even more cooler, and even more over the top with the production.

"We just always wanna step up. Obviously DNA came out and we were buzzin' about it, we were so excited, and then Salute came out and we thought, 'Oh my gosh'. We worked so hard on it - even just 'Salute' the song, we're so proud of it that it's hard to top that."

Bandmate Leigh-Anne Pinnock meanwhile added: "So now we're just gonna have to get in there and get ready - yeah 'cus everyone says that the second album is the hardest but I think the third is the hardest. We're getting there, we're just so busy at the moment as well so we haven't really had that many writing sessions. Remember though, when we heard 'Wings' and we heard 'Salute' and we heard 'Move', we knew it was the right one, so I think we just have to wait to hear that right song. We always have that moment when you go in and then there'll just be one song and you're like, 'That's definitely gonna be it'."

Little Mix meanwhile are due to continue their UK and Ireland tour tonight (May 30) in Plymouth.

Watch Little Mix's 'Salute' video below: