'The X Factor' competition is heating up! After narrowing 60 contestants down to 24, the judges enlist the help of some superstar guests -- including Justin Bieber and Nick Jonas! Justin helps out L.A. Reid during the "judges' houses" round, while Nick teams up with lifelong pal Demi Lovato.
"The reason why I picked Nick [as a guest judge] is because we grew up together," Demi says. "We've known each other since we were 14 and now we're 20 years old and we've continued to have successful careers. He's been all over the world, sold so many records, hit songs. I mean, he knows what he's talking about."
Nick was equally thrilled to be working with Demi again. "When I got the call from Demi to be the special guest in her house, I think my initial reaction was a little bit overwhelmed with the idea of having to sort of decide these six very talented peoples' fate," Nick says. "But I knew that Demi needed a friend, someone she was comfortable with. We've had a long relationship and working relationship together, so I was thrilled she gave me a call."
Watch Demi and Nick discuss a contestant during 'The X Factor' "judges' houses" round:
And check out the clips of Justin Bieber's guest judge appearance at L.A. Reid's house below:
The "judges' homes" round of 'The X Factor' starts Wendesday, October 10, at 8 p.m. on FOX.
Which contestants do you think they're discussing? Who do you hope wins this season of The X Factor?
Photos: Courtesy of J-14; Island Def Jam