Pulling out all the stops for the magazine's 50-year anniversary, the sensual Kate Upton is rumored to pose in a bikini...in "zero gravity space!"

Reports state that the 21-year-old was photoed in a zero-gravity chamber, wearing a sexy silver swimsuit, showing off her goods, and leaving her hair "looking like something out of 'Barbarella.'"

Kate posed for the magazine last year, with nothing more than a tiny, stringy white bikini as protection against the icy elements, and of the experience, she said, "I was losing hearing and eyesight because my body was shutting down!"

And although we don't know who the cover girl will be for the latest issue of the magazine, the anniversary copy hits newsstands on February 11th of this year. Don't miss it!