Ed Sheeran, One Direction and Olly Murs - who have already performed on the ITV1 show this series - will also be making a return for the finale episodes.
And if that's not enough, 'All About The Bass' singer Meghan Trainor will be there too. Exciting!
Last night, Lauren Platt was eliminated from The X Factor during the semi-final.
The 17-year-old singer, who was mentored by Cheryl Fernandez-Versini, found herself in the bottom two with Italian hopeful Andrea Faustini.
The pair went head-to-head in a sing-off but all of the judges bar Cheryl voted to send Lauren home.
Andrea will now go up against Ben Haenow and Fleur East next weekend during the nail-biting final - but who will be crowned this year's X Factor champ?
Last night, as she sailed through on the public votes, Fleur took to Twitter after discovering her rendition of Mark Ronson and Bruno Mars' 'Uptown Funk' was No 1 in the iTunes chart.
"We did it!!! Thank you so much!! Could not have done it without all of you #FleurChampions," she tweeted.