The former Pussycat Doll, who is mentoring the girls on the current series, told Alan Carr on Chatty Man that the show looked out for hopefuls who didn't make it to live shows.
Nicole said: "When the contestants don't get picked, they fly home that afternoon. They do get counselling when they come home as a lot of them are so young."
The 'Boomerang' singer's judges' houses in Antigua featured plenty of tears as she whittled her top six down to just three: Abi Alton, Tamera Foster and Hannah Barrett.
Meanwhile, the star has also defended the amount of crying broadcast at judges' houses, insisting every tear was genuine.
"Obviously they weren't crying the entire time, that's just what makes the edit. It shows how much it means to them and how much they are fighting for it."
She added: "I was quite proud of myself, I didn't cry as much as I usually do but it's very emotional. It's real, it's not contrived."
Nicole said having send contestants like Jade Richards and Melanie McCabe home was "brutal", saying: "It broke my heart. I lose sleep over this show all the time."
Her full interview airs tonight at 9.50pm on Channel 4.
The X Factor live shows kick off tomorrow night on ITV, where the top twelve acts will take to the stage to perform 80s classics.
Check out the top twelve's glam makeovers below!
Copyright: Nicky Johnston/Thames/Syco