The Bridget Jones star narrowly avoided a messy exit after comedian David Letterman challenged her to take a swing at a colourful papier-mache creation stuffed with the green dip on his show.
Zellweger was surprised to learn the treat, which "includes bats and wet naps" can be ordered off the menu at her New York taco restaurant the Blue Parrot - blaming the zany idea on her business partner, Jon Bon Jovi.
But the star was a good sport, swinging at the flying pinata until it fell to the ground and cracked open.
Admitting she wanted to taste the treat, the actress mused, "Where's the chips?".