Enrique Iglesias and Pharrell Williams to guest judge on "X Factor"?

(CBS) A source is telling People Magazine that Enrique Iglesias and Pharrell Williams will be guest judges on the Oct. 12 episode of  "X Factor." They'll be joining Rihanna and Mariah Carey, who are also rumored to be guest judges.

Pictures: "X Factor" on the red carpet
Pictures: Rhianna
Pictures: Mariah Carey

Show creator and judge Simon Cowell told the Hollywood Reporter that judge L.A. Reid was "expected to bring in stars," and it seems as if  he's doing just that. A source told TMZ that Rihanna was set to be a judge, and Mariah Carey and Simon Cowell have strongly hinted that she'll be on the show in some capacity, according to People Magazine.

"The acts were totally blown away meeting their mentors at these amazing homes - then it was even more nerve-racking performing for a guest judge," a source said to People Magazine. "Some of the girls especially were delighted when they saw Enrique and Pharrell. The acts who met Rihanna were totally speechless -- who knows how they managed to sing!"