SPOILER ALERT! X Factor's "big twist" for the first live show weekend has been revealed - the judges will each have to vote off one of their OWN acts!
There won't be a public vote, and a total of four acts will go home on Sunday.
Judge Louis Walsh said the twist's designed to make the contestants "step up a gear" for the live shows.
Gary Barlow explained: "This is the X Factor stage - it's one thing singing by the pool but it all changes here."
He added: "This is where stars are born, like Leona [Lewis] - it's all going to feel very different on Saturday."
Tulisa Contostavlos assured the final 16: "Please understand all of you that none of us have made our decision.
"It's a clean slate and we are making our decision as if we have never seen you before."