Nicki Minaj and Keith Urban were confirmed as new additions to the show's panel today (September 16).
Mariah Carey, who was named as a new addition to the judging panel earlier this summer, also joined Randy Jackson and host Ryan Seacrest for filming in New York City.
Urban joins the show having previously been a coach on The Voice Australia alongside Seal, Delta Goodrem and Good Charlotte's Joel Madden.
Carey was due to appear on The X Factor USA's first season last year as Simon Cowell's guest mentor at Judges' Houses, but was prevented from appearing by Hurricane Irene.
American Idol is expected to return to Fox in early 2013.