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. My body was shutting down because it was working so hard to keep me warm.”
“She braved six days in a bikini while we were head-to-toe in jackets,” said Day, who accompanied Upton on the frigid shoot.