Heidi Klum chatted about season 21 of "Project Runway" on "GMA" and revealed a hint about her Halloween costume this year.

Heidi Klum and Sofia Vergara were spotted during Project Runway BTS moments in matching yellow outfits, as friends often do.

The Gist: Klum is indeed back as host, seven years after she and Tim Gunn left the show to produce and star in Making The Cut on Prime Video. However, Gunn wasn’t asked to return alongside Klum; former Runway winner Christian Siriano remains in the mentor role (he did double duty as host and mentor for the past couple of seasons).