In the 30 second clip, the 34-year-old blonde - clad only in a plain black bra - fondles and jiggles her ample boobs as she sings, dances, yodels and announces "I've got great knockers!"
After explaining how her nipples stand to attention when it's cold, Heidi shouts: "You guys have no clue about boobs, and if you don't."
Heidi then grabs her chest and makes a machine gun sound as she aims her breasts left and right, in the manner of a fembot killer robot from the 'Austin Powers' films, who could fire bullets from their breasts.
The commercial ends with Heidi grinning as she declares: "Great knockers, I loooove it!"
The Victoria's Secret Fashion Show airs on December 4.