Little Mix Perform 'Power' & 'Reggaeton Lento' With CNCO on 'X Factor UK' - Watch Now!

Little Mix totally just killed it on X Factor UK!

The hugely successful girl group returned to the competition show that originally launched them to superstardom on Sunday night (December 3) to perform their latest hits: “Power” and “Reggaeton Lento” with CNCO.

PHOTOS: Check out the latest pics of Little Mix

The group has had a banner year: their latest studio album, Glory Days, spent five weeks at No. 1 in the UK – the most for a girl group since the Spice Girls. It’s also the biggest-selling album by a female group this millennium!

Watch Little Mix‘s major X Factor performance below!