Heidi Klum shared a behind-the-scenes peek at lunch on the Project Runway set, with Christian Siriano comparing Heidi’s meal to fellow supermodel Iman’s green juice - and teasing that her lunch preferences were the reason her dress wouldn’t zip up. “Behind the scenes and bursting at the seams 😂😋 ,” joked Heidi, 53, as she shared the clip. We know which lunch we’d choose!🍴 📽️: #heidiklum #christiansiriano #projectrunway