Rebecca Ferguson says she still feels sick when she watches The X Factor, despite not being a contestant any more.
The singer and mother-of-two released an acclaimed debut album and has got a British and US record deal under her belt since leaving the ITV1 show.
But she said that when she watches The X Factor - and when she recently sang on it - the fears come flooding back.
"Despite everything I've done over the last two years, my album and appearing in America, I just felt like a contestant all over again when I went back in October to perform on The X Factor," she said.
"It was really nerve-wracking. I was in a state beforehand about what to wear and I took ages to choose my outfit. It was only when I finally walked on stage that I was able to tell myself, 'Calm down, relax and have fun' - and I did."
Rebecca, 26, added: "Whenever I watch this year's contestants, it makes me nervous inside, because I know exactly what they're going through. Each time the results come through for them, I feel sick, just as I used to when I was on it. The strain of not knowing whether you're going to be there for another week is unbelievable."
Rebecca has teamed up with Sony, which has launched an interactive book, Wonderbook: Book Of Spells, for PlayStation 3, featuring writing by Harry Potter author JK Rowling, to inspire parents to read with their children.