Their Twitter handle told its followers that a fifth judge is to be revealed this Friday (30 August), only a day before the whole show returns to our TV screens.
This comes after producers have decided to change up their voting system as they'll give viewers 200 seconds to vote for their favourite after all the contestants have performed.
The tenth series will see the return of Sharon Osbourne, Gary Barlow, Louis Walsh and Nicole Scherzinger.
The show will be broadcast on Saturdays and Sundays so you'll be glued to the sofa all weekend.
Who do you think the mystery judge is?
SHARON OSBOURNE HAPPY ON X FACTOR RETURN
THE 10 FUNNIEST X FACTOR AUDITIONS EVER
GARY BARLOW CONFIRMED TO LEAVE X FACTOR