Now, they've opened up to This Morning about self-expression, and how their look has changed throughout the years, as Jesy joked that they used to look "very cheap and tacky".
Leigh-Anne recalled a story from about seven years ago of when Perrie's mum had dropped the girls off at the supermarket - but she'd been too scared to get out of the car as she didn't have any makeup on.
Leigh-Anne admitted, "I can’t believe I used to think like that, because now I way prefer my face just bare," as Perrie added, "But I think that comes with age and confidence. I mean we still like to experiment with makeup, what girl doesn’t?"
On how their looks have changed through the years, Perrie said, "We went from really young fresh girls not really wearing much makeup, maybe a little foundation on the lip when it was in, to then being really heavy and looking way older. We looked way beyond our years."
Swipe through to see Little Mix's transformation through the years...
2011
After being put into a group by Kelly Rowland on The X Factor in 2011, the Little Mix girls rocked denim and trainers as they posed at the Judges Houses' stage of the competition.
Little Mix open up about confidence and how they banish negativity
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2018
The girls then changed into smart black and white suits for their first ever performance of 'Woman Like Me' with Nicki Minaj.
2011
After being put into a group by Kelly Rowland on The X Factor in 2011, the Little Mix girls rocked denim and trainers as they posed at the Judges Houses' stage of the competition.
2011
Throughout their time on The X Factor, Jade, Perrie, Jesy and Leigh-Anne stuck with the same 'colour and prints' theme for performances, each making an identify for themselves.
2011
Attending the Twilight Breaking Dawn Part 1 premiere in 2011 with their X Factor mentor Tulisa, the Little Mix girls dressed up in stunning LBDs.
2011
After winning The X Factor ahead of Marcus Collins, Little Mix started to make an identity as a band, co-coordinating their outfits both on stage and at events.
2012
One year on from their historic win on The X Factor, Little Mix returned to perform their brand new single, looking more grown up.
2012
At the launch for Little Mix's debut album 'DNA', Jade, Perrie, Leigh-Anne and Jesy looked stunning in black outfits.
2013
All of the Little Mix girls have experimented with their hair colours, but in 2013 Perrie went for purple, whilst Jade was rocking the colour blue.
2013
Attending their first ever BRIT Awards in 2013, Little Mix dressed up for the occasion, all wearing totally different outfits.
2013
Experimenting even further with her hair in 2013, Perrie changed her look from purple to dip dye pink later in the year.
2016
After taking some time off to work on their new album, Little Mix returned in 2016 with a brand new look. Looking a lot more grown up, the girls started to wear a lot more custom-designed outfits on stage.
2015
Perrie couldn't resist getting into the Disney spirit in 2015 when she made a trip to Disneyland Paris!
2016
Walking the red carpet ahead of their first ever BRIT Awards performance, Little Mix oozed glamour as they invited their mums along for the party.
2016
That same night the girls took to the stage in matching green and black outfits to give an incredible performance of their hit song 'Black Magic'.
After taking more of an interest in fashion, attending various fashion events with her band mate Jade Thirlwal, Leigh-Anne started to take inspiration, wearing this cute number for her birthday in 2017.
2017
Little Mix embraced the race driving theme brilliantly in 2017 when they performed at F1 Live in London.
2017
The girls attended the Nickelodeon Kids' Choice Awards in Los Angeles in 2017, rocking the red carpet with their different outfit choices.
2017
Whilst Perrie, Jade and Leigh-Anne stuck with their natural hair colours in 2017, Jesy experimented a lot, even dying her hair bright pink!
2018
Looking completely stunning, Jade, Leigh-Anne, Jesy and Perrie rocked the red carpet at the 2018 BRIT Awards. Whilst most fans loved their look, Jesy, Jade and Perrie were quick to mock Leigh-Anne for wearing her 'dressing gown'.
2018
Little Mix stars Leigh-Anne and Jade attended The British Fashion Awards in 2018, wearing stunning dresses to the prestigious event.
2018
The girls went for a more retro look during a performance to their fans in Germany in 2018.
2018
At the launch of their amazing album 'LM5' in 2018, Leigh-Anne, Jesy, Perrie and Jade looked casual and chic as they signed copies of their album for fans.
2018
Ahead of their performance with American rapper Nicki Minaj, Jesy injected a bit of colour into Little Mix's red carpet look at the 2018 MTV EMA Awards, whilst Leigh-Anne rocked green dreadlocks.
2018
The girls then changed into smart black and white suits for their first ever performance of 'Woman Like Me' with Nicki Minaj.
2011
After being put into a group by Kelly Rowland on The X Factor in 2011, the Little Mix girls rocked denim and trainers as they posed at the Judges Houses' stage of the competition.
2011
Throughout their time on The X Factor, Jade, Perrie, Jesy and Leigh-Anne stuck with the same 'colour and prints' theme for performances, each making an identify for themselves.
2011
Attending the Twilight Breaking Dawn Part 1 premiere in 2011 with their X Factor mentor Tulisa, the Little Mix girls dressed up in stunning LBDs.
2011
After winning The X Factor ahead of Marcus Collins, Little Mix started to make an identity as a band, co-coordinating their outfits both on stage and at events.
2012
One year on from their historic win on The X Factor, Little Mix returned to perform their brand new single, looking more grown up.
2012
At the launch for Little Mix's debut album 'DNA', Jade, Perrie, Leigh-Anne and Jesy looked stunning in black outfits.
2013
All of the Little Mix girls have experimented with their hair colours, but in 2013 Perrie went for purple, whilst Jade was rocking the colour blue.
2013
Attending their first ever BRIT Awards in 2013, Little Mix dressed up for the occasion, all wearing totally different outfits.
2013
Experimenting even further with her hair in 2013, Perrie changed her look from purple to dip dye pink later in the year.
2016
After taking some time off to work on their new album, Little Mix returned in 2016 with a brand new look. Looking a lot more grown up, the girls started to wear a lot more custom-designed outfits on stage.
2015
Perrie couldn't resist getting into the Disney spirit in 2015 when she made a trip to Disneyland Paris!
2016
Walking the red carpet ahead of their first ever BRIT Awards performance, Little Mix oozed glamour as they invited their mums along for the party.
2016
That same night the girls took to the stage in matching green and black outfits to give an incredible performance of their hit song 'Black Magic'.
After taking more of an interest in fashion, attending various fashion events with her band mate Jade Thirlwal, Leigh-Anne started to take inspiration, wearing this cute number for her birthday in 2017.
2017
Little Mix embraced the race driving theme brilliantly in 2017 when they performed at F1 Live in London.
2017
The girls attended the Nickelodeon Kids' Choice Awards in Los Angeles in 2017, rocking the red carpet with their different outfit choices.
2017
Whilst Perrie, Jade and Leigh-Anne stuck with their natural hair colours in 2017, Jesy experimented a lot, even dying her hair bright pink!
2018
Looking completely stunning, Jade, Leigh-Anne, Jesy and Perrie rocked the red carpet at the 2018 BRIT Awards. Whilst most fans loved their look, Jesy, Jade and Perrie were quick to mock Leigh-Anne for wearing her 'dressing gown'.
2018
Little Mix stars Leigh-Anne and Jade attended The British Fashion Awards in 2018, wearing stunning dresses to the prestigious event.
2018
The girls went for a more retro look during a performance to their fans in Germany in 2018.
2018
At the launch of their amazing album 'LM5' in 2018, Leigh-Anne, Jesy, Perrie and Jade looked casual and chic as they signed copies of their album for fans.
2018
Ahead of their performance with American rapper Nicki Minaj, Jesy injected a bit of colour into Little Mix's red carpet look at the 2018 MTV EMA Awards, whilst Leigh-Anne rocked green dreadlocks.
2018
The girls then changed into smart black and white suits for their first ever performance of 'Woman Like Me' with Nicki Minaj.
As Jesy joked that the girls had once looked "very cheap and tacky", Perrie exclaimed, "Jess! It was the style back then. We just felt more secure with lots and lots of makeup on. I do really just think that we’ve got better at knowing what we suit and we don’t feel the need to pile it on anymore."
Leigh-Anne also added, "And we don’t feel the need to get rid of our eyebrows to really thin ones, why I did that...?"
When asked how they're able to banish the negativity, Leigh-Anne sweetly affirmed that the Little Mix girls "compliment each other and boost each other every day." Aww!
You can hear Little Mix's biggest hits on the Northsound 1 playlist.
NOW WATCH: Little Mix answer the Internet's biggest questions about them!
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