With Shout Out To My Ex, the four piece now have a Number 1 for each member and more than any other winner from the show.
Leona Lewis and Alexandra Burke used to hold the record with three apiece.
Little Mix are now tied with Olly Murs and One Direction in second spot for the most Number 1s of any X Factor act of all time.
JLS remain the ones to beat despite having split up three years ago now: They scored a total of 5 number ones since making the final of the show in 2008.
But we reckon it won't be long until they're beaten...
Meanwhile, in more good news for the Little Mix girls, they're set to stay on the chart summit for another week.
According to today’s Official Chart Update, Shout Out To My Ex is on its way to easily top the charts once more and is currently 21,000 sales ahead of their closest competition.
For a second week in a row, it could be an X Factor top two with James Arthur’s former Number 1 Say You Won't Let Go just behind the girls.
And that in turn could become an X Factor top three next week with Louisa Johnson announcing her new song So Good.
The track will drop on Friday before a performance on The X Factor on Sunday night.