On Wednesday night, Tim Gunn made a guest appearance on Conan O'Brien's late night show on TBS. The Project Runway star, as always, had plenty to say (who can forget his tirade about Taylor Momsen?) but it was his hatred of Jeggings that truly piqued Conan's interest. Turns out Conan has a fear-based obsession with the leggings-meet-jeans, and while the two had a hysterical conversation about the too-tight-pants, Conan took it a step farther by promising to wear a pair for an entire episode of his show the following night. As promised, Coco rocked some of the tightest and teeniest Jeggings we've ever seen, and though he made a questionable styling choice by pairing his stovepipe pants with his usual dress shirt, shoes, and tie, we have to say Bravo to Conan for being such a sartorial risk-taker, in the name of a good laugh. And as it turns out, it was a good experience for Coco, at least according to his Twitter page: "Tonight I wore jeggings while interviewing the Kardashians. I'm never taking them off. You can pry them from my cold, Irish legs. #jeggings." (iVillage)