Does The X Factor have Bieber fever?
It appears so. Justin Bieber joined judge L.A. Reid as a celebrity mentor for his over-25 group of contestants this week, JustJared.com reports.
"Long day but great day," Bieber tweeted Monday. "@LA_Reid @ScooterBraun just like old times!"
Sneak Peek: Simon Cowell, L.A. Reid, Britney Spears and Demi Lovato discuss The X Factor 2.0
Nick Jonas is reportedly the celebrity mentor teaming up with Demi Lovato. There's no word on who will be partnering with Britney Spears or Simon Cowell.
The X Factor kicks off its second season on Wednesday, Sept. 12 at 8/7c on Fox.