#9: Heidi Klum as Fiona from Shrek
For Halloween 2018, Heidi Klum traded supermodel glam for full green ogre realness. She transformed into Princess Fiona, prosthetics and all, complete with velvet gown, ogre ears, and even detailed green fingers and toes. Standing on the red carpet, she looked less like herself and more like CGI come alive.

What made this costume legendary was Klum’s total commitment. No shortcuts, no half-measures—just hours of makeup and special effects artistry. It was equal parts grotesque and delightful, the kind of jaw-dropping transformation that has kept Klum’s Halloween parties in a league of their own year after year.
