Lifetime already has Project Runway and its various offshoots, including the upcoming Project Runway: All Stars and Project Runway: Accessories. Now the cable network has picked up a new unscripted fashion competition series 24 Hour Catwalk with a 10-episode order. Hosted by TV personality Alexa Chung, 24 Hour Catwalk puts four designers to the test of creating their own collection … in one day. After a first-cut challenge and elimination, the competition whittles down to two, each tasked with creating a themed collection for their own runway show. Tapped for judges on the show are designer Cynthia Rowley, New York Times fashion editor Derek Blasberg and publicist James LaForce. Jane Street Entertainment is producing, with Linda Lea and Donna Macletchie executive producing.