(Reuters) – Swimsuit model Kate Upton said on Tuesday her body shut down after she posed in a skimpy bikini in Antarctica for Sports Illustrated magazine. Upton, wearing only a white bikini bottom and an unzipped white parka, was picked as the cover girl for the annual Sports Illustrated swimsuit issue, unveiled on Monday, for the second consecutive year. "It was freezing," Upton, 20, told NBC's morning TV show "Today" on Tuesday. "I'm from Florida, so it wasn't easy for me. "When I came back, I was losing my hearing and eyesight. …