And if there's anyone who knows about making a good first impression, it's them.
The four sisters wowed the judges back at their first try out last year and their original audition has since notched up close to 80 MILLION views.
In fact, it's the second most watched X Factor audition in history with only Ablisa's bust up been watched more times.
So what is the perfect pop group's advice?
Be yourself and KNOW your music!
"Based on our experience, we’d say being yourself is really, really important," the girls explained.
They told Maximum Pop: "Knowing your music too, just show what you’ve got. Enjoy everything because a lot of singers have a voice but it’s really different when you enjoy it and have confidence, you know what you want to say and what your music sounds like."
And in a chat with us, 4th Impact's fellow live show finalist from 2015 Kiera Weathers advised: "Just stay true to who you are and enjoy it."
X Factor bosses kicked off the call for talented singers to audition for the next series in last year's live shows.
As usual, you can register to audition either in person at one of a number of cities in the UK or audition online by simply uploading a video.
The age limit is 16 once again but if you're 15 right now you can still apply so long as you're sixteen years of age or over by the 1 July 2017.
You can register to audition in person or so online 24/7 with a video here.