John Legend's model fiancee Chrissy Teigen refuses to sport underwear because she always prefers to go commando. The Sports Illustrated beauty made the confession during a revealing interview on comedienne Joan Rivers' U.S. reality show Fashion Police on Friday (09Aug13), when she admitted she was not wearing undergarments, despite donning a mini-dress on air. She said, "I just don't (wear underwear), I don't like it." Rivers then quizzed Teigen about her no panties rule during days when she's on her period, and the model went on to share a little too much about how she handles "heavy flow days". She explained, "The string (for the tampon) goes in your butt crack. (Like) sometimes on music video sets, they will trim it 'cause you know the girls are in thongs..."