Jennifer Lopez was scheduled to take her turn as guest judge on the season finale of Project Runway, but, it seems those plans have taken a spill -- or, at least, Jen has.

According to Access Hollywood, show creator and host, Heidi Klum, announced that Jen would not be appearing “due to a foot injury.” Instead, the show’s own Tim Gunn will be filling J.Lo's now-too small shoes. Heidi told the crowd about Jen's backout at the Project Runway Season Five Finale Fashion show at Mercedes-Benz Fashion Week in NY.

Jenny has been training for a triathalon in Miami, so her hurt stem may be related to that. Here's hoping she's back on her foot soon.