Tyra Banks, Nigel Barker and J. Alexander will all continue to serve as the other members of the show's judging panel.
The guest judges will include several faces that may already be familiar to reality TV viewers -- including former The Hills star Lauren Conrad, Keeping Up with the Kardashians star and former Dancing with the Stars participant Kim Kardashian, and model and former Dancing with the Stars participant Josie Maran.
Fashion model Chanel Iman will serve as the guest judge for the thirteenth season's special two-hour premiere, which will air on Wednesday, September 9 at 8PM ET/PT.
Iman will be followed by Conrad (Episode 2), petite model Jaime Rishar (Episode 3), actress and model China Chow (Episode 4), Maran (Episode 5), spokesmodel Jessica White (Episode 6), Kardashian (Episode 7), model Kirsty Hume (Episode 8), supermodel Marisa Miller (Episode 9), and Seventeen Magazine editor-in-chief Ann Shoket (Episode 10).
America's Next Top Model's thirteenth season will feature contestants who are all 5' 7" or under -- a complete turnaround from the show's first 12 seasons, which required contestants be 5' 7" or taller. The winner will receive a $100,000 contract with CoverGirl Cosmetics, a contract with Wilhelmina Models and a cover and six-page spread in Seventeen Magazine.
"The current state of the economy has forced shows to make major budget cuts industry wide," Top Model producers Tyra Banks and Ken Mok said in a statement. "America's Next Top Model is not immune to these financially challenging times. We've had to make significant cuts in every area of the production and, unfortunately, Paulina was a casualty of these cuts."
Porizkova had first revealed her firing during a May 12 appearance on CBS' The Late Late Show.
"Just to be fair here, the reason I was told I was fired was because, it seemed that America's Next Top Model had gotten too fat and they needed to cut some fat and the fat was me," Porizkova told host Craig Ferguson.