With already a bikini-clad photo on the cover of the Sports Illustrated swimsuit issue and GQ magazine, model Kate Upton is now posing nude for a spread for Contributor magazine.

The 20-year-old Florida native lies in one image on a bed with nothing on but a few pieces of jewelry and in another, the model is flaunting her bum to the camera with turning away her naked chest. In most of the images she either sports a bikini or some leopard printed cover-up that still does not leave much to the imagination.

Click here to see all the images.

All the clothes were by Guess and the photos were snapped by photographer Yu Tsai. Some say her serious demeanor and the sultry images are very different from the persona the blond bombshell has promoted in past photos.

According to Yahoo!, Upton has become the model identified primarily with "skimpy, barely-there bikinis, but it seems like she's a girl without a real identity. Guys lover her; the fashion industry seems to hate her."

She also received criticism from a Victoria's Secret casting director, who told The New York Times in February, "She's like a Page 3 girl. She's like a footballer's wife, with the too-blond hair and that kind of face that anyone with enough money can go out and buy. We would never use Ms. Upton for a Victoria's Secret Fashion show."

The newspaper also reported that Upton had a last count of 170,000 Twitter followers and a YouTube video with over 3 million viewers - and that was calculated back in February.

The model rose to fame first as a Youtube star. After posting a video of herself doing the popular Dougie dance at a Los Angeles Clippers basketball game, a modeling scout brought Upton to the attention of the head of IMG Models and the rest was history.

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