According to the Hollywood Reporter, Demi Lovato will be joined by guest judge Nick Jonas for the judges' houses bit of The US X Factor.
It's also rumoured that Lovato will 'mentor' the 12 — 16 year-olds category (!), Britney the 17 — 24 year-olds, and LA Reid the over-25s. Simon Cowell will make do with the groups.
It's not yet been confirmed who will be helping the others out in their fake houses, but it's believed that for good old Nick Jonas this might be a trial run to see if he'll be any good to take one of the empty judges' seats on American Idol.