It comes after Louis was left with only one group 5 After Midnight when BRATAVIO were voted off on Sunday.
An insider revealed to The Sun: “Louis really liked the girls but was under a lot of pressure to put through Bradley and Ottavio because they were deemed to be great entertainment.
The Group through are Four of Diamonds which will please everyone who backed them at Louis judges' house.
Louis said: “At the time a lot of viewers were disappointed that I didn’t put the girls through, now that a place has opened up in my category, I’ve listened to the fans and am delighted to be bringing the girls back.
“They’re a great girl group and I’m hoping will take me all the way to the final.”
Four of Diamonds added: “We are so excited to be back on The X Factor we’re really looking forward to performing live, working hard and showing everyone what we’re made of.’