Fox has announced Star Wars trilogy star Carrie Fisher and longtime actor, producer, director, and writer Gary Marshall will both serve as permanent judges for Fox's On the Lot, Mark Burnett and Steven Spielberg's new American Idol-like movie-making reality competition series.

Fisher and Marshall -- along with X-Men: The Last Stand and Rush Hour 3 director Brett Ratner, who won't be returning -- served as guest judges for On the Lot's "Hollywood Boot Camp" audition rounds that narrowed the show's 50 semifinalists to the 18 finalists who will now compete for a $1 million DreamWorks development deal.  Going forward, the pair will now be joined by a third weekly guest judge

In addition to Fisher and Marshall's promotions to permanent status, Fox has also announced that although she hosted On The Lot's two semifinals episodes, Chelsea Handler will not serve as show's regular host.  Instead, Adrianna Costa, a former CNN Headline News entertainment news anchor, will host the show.

On the Lot's first two-hour "Film Premiere" episode -- the show's version of Idol's weekly performance episodes -- is scheduled to air Monday, May 28 at 8PM ET/PT and feature the comedic short films produced and directed by the 18 finalists who survived "Hollywood Boot Camp."  After they're "screened," the finalists' projects will then be judged by Fisher and Marshall, as well as this round's guest judge, Disturbia director D.J. Caruso.  During On the Lot's subsequent "Box Office" results show (On The Lot's version of Idol's weekly results shows) on Tuesday, May 29 at 8PM ET/PT, viewers' votes will be revealed and three finalists will be eliminated.

On the Lot's weekly one-hour "Film Premiere" episodes will then start to air in its regular time period beginning Monday, June 4 at 8PM ET/PT, and the weekly half-hour "Box Office" results shows will air on Tuesdays at 8PM ET/PT starting Tuesday, June 5.