"It's taken more than a decade but I'm delighted to finally be on a panel with three girls [I think!,]" Cowell, who is also an executive producer on the show, said in a statement Monday.
"Paulina and Kelly both have great taste and massive experience in the music industry and together with Demi, this is going to be a fun panel. It just feels like the time to do something different."
2014: The Year in Fashion [PHOTOS]
Tatiana Maslany to make her New York stage debut