RihannaXFactor091211.jpgIf the rumors are right, The X Factor really will have some powerhouse guest stars!

Rihanna is reportedly in talks to guest judge on the reality show's first season, which premieres on FOX September 21.

The "Cheers" singer previously performed during the U.K. X Factor's finale, so it would be a natural transition to guest on the U.S. version. Plus, Ri Ri is signed to Island Def Jam, the label X Factor judge L.A. Reid headed for seven years.

Simon Cowell promised that Reid is “expected to bring in stars," and if Rihanna comes through, the former record exec will be living up to that lofty goal.

FOX told X17online that they had no comment on the Rihanna rumor.