Renee Zellweger may have brought the va va voom factor to Letterman last night in her body-hugging red Old Hollywood dress, but one of her talking points was far from glamorous. While chatting with Dave about shooting Chilled In Miami in temperatures she claimed reached 57 below, Renee delves deep into the physical effects that kind of weather can have on the body, particularly the ways in which bodily fluids react to icy weather. And those effects do not look pretty in close-ups. But thanks to her sugary Southern accent and last-minute decision to impersonate her own snot for Dave, we're ready to forgive her for all that twitchy Hitchcock-inspired emoting she slaughtered us with last month. [CBS]