Little Mix have revealed their shock at seeing their debut album hit No.4 in the US charts.

And they have compared their fans' reaction in the States to the overwhelming fanaticism Justin Bieber receives.

As previously reported, the British girl group's maiden record 'DNA' landed at an impressive No.4 on the charts this week.

Speaking to Billboard, Jesy Nelson admitted that she is surprised at the amount of fans they have over the pond. She said:

"Just seeing the amount of fans that we actually have [in the US] is so overwhelming. When we go to our signings, it's crazy - we feel like Justin Bieber when we go."

She added: "It's crazy, and we've never felt like that before, and it's just amazing."

Little Mix's chart success means that they are the highest ever charting British female group in the US with a debut album.

The previous record was held by the Spice Girls, who saw their first album 'Spice' enter the US chart at No.6 in 1997.