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Tonight, 24 become 16.

Britney Spears, Demi Lovato, Simon Cowell and L.A. Reid will have to make seemingly impossible cuts from their groups on Wednesday night, and in this sneak peek of the emotional new episode, Demi can be seen breaking the news to members of her Young Adults group.

Video: 'X Factor' Guest Mentors Dish on Competition

Watch a preview of the painful cuts as it all goes down at the Give Your Heart a Break singer's downtown L.A. loft.

Video: 'X Factor' Judge Demi Lovato Distracted by Hot Guys?

And don't miss tonight's new episode of The X Factor on FOX as the mentors and their singer move one step close to the live shows beginning next week!