On Oct. 31 the 45-year-old held her 19th annual costume party and absolutely killed it as Fiona from Disney’s animated franchise Shrek ... she spent eight hours making her transformation ...

Heidi Klum, who has previously worn Jessica Rabbit and Betty Boop costumes for Halloween, really out did herself this year by undergoing a full make-over to become Fiona from the movie Shrek.

The Arrow star dressed up as Princess Fiona from the Shrek films ... maroon wig didn’t make it to the end of the soiree - which is a shame because it really tied the costume together.

For Halloween 2018, Klum transformed herself into Princess Fiona from "Shrek" — and with her ... working with a prosthetics company to create her costume. She proceeded to share pictures of ...