Enrique Iglesias and Pharrell Williams to Guest Judge The X Factor

Pharrell William (left) and Enrique Iglesias

Frazer Harrison/Getty; Jordan Strauss/WireImage

updated 10/12/2011 AT 11:00 AM ET

originally published 10/12/2011 AT 12:30 PM ET

They survived boot camp but can they make it on the home front?

The X Factor’s 32 remaining contestants are heading to the homes of Simon Cowell, Paula Abdul, Nicole Scherzinger and L.A. Reid this week to work closely with the judges … and their surprise star guests.

Pharrell Williams and Enrique Inglesias are two of music’s heavy hitters who will help the hopeful vocalists on Wednesday night’s show (FOX, 8 p.m. ET) before they face another round of elimination on the road to The X Factor’s live shows. Rihanna and Mariah Carey, who was Cowell’s choice for the gig, will also act as guest judges in the latest round of competition.

“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 tells PEOPLE. “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!”


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