As the news broke that Enrique Iglesias and Pharrell would be on The X Factor, FOX has announced that Rihanna will be helping LA Reid to mentor the boys.
As their press release says:
This week, the 32 acts that survived “Boot Camp” are whisked away to their judge’s home, or to a location of their judge’s choice, for a final shot at earning a place on the live shows. Be there as Rihanna joins L.A. Reid to mentor the boys.