The 24-year-old joined the panel as part of a shake-up for the eighth series in 2011, and went on to secure victory with Little Mix having mentored the groups category.
However, speculation about her future on the show begun towards the end of last year's run after her debut album The Female Boss flopped in the charts, peaking at number 35.
Earlier today, Tulisa took to her Twitter page to clear up the rumours once and for all. She wrote: "Just wanted to let you all know that I won't be part of the X Factor panel this year.
"I've had a great time on the show, but this year it's time to do something different. I'd like to thank everyone on The X Factor for two amazing years.
"Stay tuned as I have a very exciting announcement soon!"
Her news comes after X Factor stalwart Louis Walsh said yesterday that he and Gary Barlow would return for the tenth series.
Meanwhile, Sharon Osbourne is widely expected to be making a comeback, with the fourth spot said to be reserved for either Nicole Scherzinger or Mel B.
The X Factor will return to our screens in August.