And now the judge has admitted that being on the show's famous stage was the scariest moment of her life.
Speaking on Tuesday's 'This Morning', Tulisa said of her performance: "That was terrifying, I don't even want to talk about that - I've never been so scared in my entire life.
"For some reason just doing it there - the pressure is completely different. Like I don't even get nervous anymore, and I literally was just - my legs started going and I was like, 'Oh my God, I can't control it, I'm going to faint'. I couldn't control anything I was doing."
She continued: "I couldn't understand it either, but I think it was the thing of the whole year that I had been through and just feeling like the media attention that was on me and the pressure from the public, and I just felt like I was being judged so much that it literally cracked me…it was more to do with the overall pressure that I had - I let it get to me which was my bad."
Tulisa performing 'Sight Of You' on 'The X Factor'
The performance came a week before her album charted at a disappointing 35 and her single at 18.
Speaking about her new album worries, Tulisa confessed to Phillip Schofield and Holly Willoughby: "It's scary, the whole process is scary. And being so used to having the boys with me either side, and what direction I was going to take it in as well, but luckily it just kind of came natural when I was in the studio."
Looking ahead to next year, Tulisa added: "2013, I've been calling it my year of enlightenment..." Before adding her thoughts on 2012, "It just hasn't been a happy year for me, so next year is my happy year."