Supermodel Heidi Klum is stripping down for her first Victoria's Secret photo shoot in a year -- and "Extra" is behind the scenes! Now, the 35-year-old catwalk queen is spilling about everything from her world class curves and diet rumors -- to a secret from the fifth season of her hit show, "Project Runway."

Catch which designer wannabes will hear "Auf wiedersehen" from Heidi, when "Project Runway" premieres tomorrow on Bravo!